*sign.txt*      For Vim version 9.1.  Last change: 2024 Jul 07


		  VIM REFERENCE MANUAL    by Gordon Prieur
					  and Bram Moolenaar


Sign Support Features				*sign-support*

1. Introduction				|sign-intro|
2. Commands				|sign-commands|
3. Functions				|sign-functions-details|

{only available when compiled with the |+signs| feature}

==============================================================================
1. Introduction					*sign-intro* *signs*

When a debugger or other IDE tool is driving an editor it needs to be able
to give specific highlights which quickly tell the user useful information
about the file.  One example of this would be a debugger which had an icon
in the left-hand column denoting a breakpoint.  Another example might be an
arrow representing the Program Counter (PC).  The sign features allow both
placement of a sign, or icon, in the left-hand side of the window and
definition of a highlight which will be applied to that line.  Displaying the
sign as an image is most likely only feasible in gvim (although Sun
Microsystem's dtterm does support this it's the only terminal emulator I know
of which does).  A text sign and the highlight should be feasible in any color
terminal emulator.

Signs and highlights are not useful just for debuggers.  Sun's Visual
WorkShop uses signs and highlights to mark build errors and SourceBrowser
hits.  Additionally, the debugger supports 8 to 10 different signs and
highlight colors, see |NetBeans|.

There are two steps in using signs:

1. Define the sign.  This specifies the image, text and highlighting.  For
   example, you can define a "break" sign with an image of a stop roadsign and
   text "!!".

2. Place the sign.  This specifies the file and line number where the sign is
   displayed.  A defined sign can be placed several times in different lines
   and files.

							*sign-column*
When signs are defined for a file, Vim will automatically add a column of two
characters to display them in.  When the last sign is unplaced the column
disappears again.  This behavior can be changed with the 'signcolumn' option.

The color of the column is set with the SignColumn highlight group
|hl-SignColumn|.  Example to set the color: >

	:highlight SignColumn guibg=darkgrey
<
If 'cursorline' is enabled, then the CursorLineSign highlight group is used
|hl-CursorLineSign|.
							*sign-identifier*
Each placed sign is identified by a number called the sign identifier. This
identifier is used to jump to the sign or to remove the sign. The identifier
is assigned when placing the sign using the |:sign-place| command or the
|sign_place()| function. Each sign identifier should be a unique number. If
multiple placed signs use the same identifier, then jumping to or removing a
sign becomes unpredictable. To avoid overlapping identifiers, sign groups can
be used. The |sign_place()| function can be called with a zero sign identifier
to allocate the next available identifier.

							*sign-group*
Each placed sign can be assigned to either the global group or a named group.
When placing a sign, if a group name is not supplied, or an empty string is
used, then the sign is placed in the global group. Otherwise the sign is
placed in the named group. The sign identifier is unique within a group. The
sign group allows Vim plugins to use unique signs without interfering with
other plugins using signs.

To place a sign in a popup window the group name must start with "PopUp".
Other signs will not show in a popup window.  The group name "PopUpMenu" is
used by popup windows where 'cursorline' is set.

							*sign-priority*
Each placed sign is assigned a priority value. When multiple signs are placed
on the same line, the attributes of the sign with the highest priority is used
independently of the sign group. The default priority for a sign is 10, this
value can be changed for different signs by specifying a different value at
definition time.  The priority is assigned at the time of placing a sign.

When two signs with the same priority are present, and one has an icon or text
in the signcolumn while the other has line highlighting, then both are
displayed.

When the line on which the sign is placed is deleted, the sign is moved to the
next line (or the last line of the buffer, if there is no next line).  When
the delete is undone the sign does not move back.

When a sign with line highlighting and 'cursorline' highlighting are both
present, if the priority is 100 or more then the sign highlighting takes
precedence, otherwise the 'cursorline' highlighting.

==============================================================================
2. Commands					*sign-commands* *:sig* *:sign*

Here is an example that places a sign "piet", displayed with the text ">>", in
line 23 of the current file: >
	:sign define piet text=>> texthl=Search
	:exe ":sign place 2 line=23 name=piet file=" .. expand("%:p")

And here is the command to delete it again: >
	:sign unplace 2

Note that the ":sign" command cannot be followed by another command or a
comment.  If you do need that, use the |:execute| command.


DEFINING A SIGN.			*:sign-define* *E255* *E160* *E612*

See |sign_define()| for the equivalent Vim script function.

:sign define {name} {argument}...
		Define a new sign or set attributes for an existing sign.
		The {name} can either be a number (all digits) or a name
		starting with a non-digit.  Leading zeros are ignored, thus
		"0012", "012" and "12" are considered the same name.
		About 120 different signs can be defined.

		Accepted arguments:

	icon={bitmap}
		Define the file name where the bitmap can be found.  Should be
		a full path.  The bitmap should fit in the place of two
		characters.  This is not checked.  If the bitmap is too big it
		will cause redraw problems.  Only GTK 2 can scale the bitmap
		to fit the space available.
			toolkit		supports ~
			GTK 1		pixmap (.xpm)
			GTK 2		many
			Motif		pixmap (.xpm)
			Win32		.bmp, .ico, .cur
					pixmap (.xpm) |+xpm_w32|
	priority={prio}
		Default priority for the sign, see |sign-priority|.

	linehl={group}
		Highlighting group used for the whole line the sign is placed
		in.  Most useful is defining a background color.

	numhl={group}
		Highlighting group used for the line number on the line where
		the sign is placed.  Overrides |hl-LineNr|, |hl-LineNrAbove|,
		|hl-LineNrBelow|, and |hl-CursorLineNr|.

	text={text}						*E239*
		Define the text that is displayed when there is no icon or the
		GUI is not being used.  Only printable characters are allowed
		and they must occupy one or two display cells.

	texthl={group}
		Highlighting group used for the text item.

	culhl={group}
		Highlighting group used for the text item when the cursor is
		on the same line as the sign and 'cursorline' is enabled.

	Example: >
		:sign define MySign text=>> texthl=Search linehl=DiffText
<

DELETING A SIGN						*:sign-undefine* *E155*

See |sign_undefine()| for the equivalent Vim script function.

:sign undefine {name}
		Deletes a previously defined sign.  If signs with this {name}
		are still placed this will cause trouble.

		Example: >
			:sign undefine MySign
<

LISTING SIGNS						*:sign-list* *E156*

See |sign_getdefined()| for the equivalent Vim script function.

:sign list	Lists all defined signs and their attributes.

:sign list {name}
		Lists one defined sign and its attributes.


PLACING SIGNS						*:sign-place* *E158*

See |sign_place()| for the equivalent Vim script function.

:sign place {id} line={lnum} name={name} file={fname}
		Place sign defined as {name} at line {lnum} in file {fname}.
							*:sign-fname*
		The file {fname} must already be loaded in a buffer.  The
		exact file name must be used, wildcards, $ENV and ~ are not
		expanded, white space must not be escaped.  Trailing white
		space is ignored.

		The sign is remembered under {id}, this can be used for
		further manipulation.  {id} must be a number.
		It's up to the user to make sure the {id} is used only once in
		each file (if it's used several times unplacing will also have
		to be done several times and making changes may not work as
		expected).

		The following optional sign attributes can be specified before
		"file=":
			group={group}	Place sign in sign group {group}
			priority={prio}	Assign priority {prio} to sign

		By default, the sign is placed in the global sign group.

		By default, the sign is assigned a default priority of 10,
		unless specified otherwise by the sign definition.  To assign a
		different priority value, use "priority={prio}" to specify a
		value.  The priority is used to determine the sign that is
		displayed when multiple signs are placed on the same line.

		Examples: >
			:sign place 5 line=3 name=sign1 file=a.py
			:sign place 6 group=g2 line=2 name=sign2 file=x.py
			:sign place 9 group=g2 priority=50 line=5
							\ name=sign1 file=a.py
<
:sign place {id} line={lnum} name={name} [buffer={nr}]
		Same, but use buffer {nr}.  If the buffer argument is not
		given, place the sign in the current buffer.

		Example: >
			:sign place 10 line=99 name=sign3
			:sign place 10 line=99 name=sign3 buffer=3
<
							*E885*
:sign place {id} name={name} file={fname}
		Change the placed sign {id} in file {fname} to use the defined
		sign {name}.  See remark above about {fname} |:sign-fname|.
		This can be used to change the displayed sign without moving
		it (e.g., when the debugger has stopped at a breakpoint).

		The optional "group={group}" attribute can be used before
		"file=" to select a sign in a particular group.  The optional
		"priority={prio}" attribute can be used to change the priority
		of an existing sign.

		Example: >
			:sign place 23 name=sign1 file=/path/to/edit.py
<
:sign place {id} name={name} [buffer={nr}]
		Same, but use buffer {nr}.  If the buffer argument is not
		given, use the current buffer.

		Example: >
			:sign place 23 name=sign1
			:sign place 23 name=sign1 buffer=7
<

REMOVING SIGNS						*:sign-unplace* *E159*

See |sign_unplace()| for the equivalent Vim script function.

:sign unplace {id} file={fname}
		Remove the previously placed sign {id} from file {fname}.
		See remark above about {fname} |:sign-fname|.

:sign unplace {id} group={group} file={fname}
		Same but remove the sign {id} in sign group {group}.

:sign unplace {id} group=* file={fname}
		Same but remove the sign {id} from all the sign groups.

:sign unplace * file={fname}
		Remove all placed signs in file {fname}.

:sign unplace * group={group} file={fname}
		Remove all placed signs in group {group} from file {fname}.

:sign unplace * group=* file={fname}
		Remove all placed signs in all the groups from file {fname}.

:sign unplace {id} buffer={nr}
		Remove the previously placed sign {id} from buffer {nr}.

:sign unplace {id} group={group} buffer={nr}
		Remove the previously placed sign {id} in group {group} from
		buffer {nr}.

:sign unplace {id} group=* buffer={nr}
		Remove the previously placed sign {id} in all the groups from
		buffer {nr}.

:sign unplace * buffer={nr}
		Remove all placed signs in buffer {nr}.

:sign unplace * group={group} buffer={nr}
		Remove all placed signs in group {group} from buffer {nr}.

:sign unplace * group=* buffer={nr}
		Remove all placed signs in all the groups from buffer {nr}.

:sign unplace {id}
		Remove the previously placed sign {id} from all files it
		appears in.

:sign unplace {id} group={group}
		Remove the previously placed sign {id} in group {group} from
		all files it appears in.

:sign unplace {id} group=*
		Remove the previously placed sign {id} in all the groups from
		all the files it appears in.

:sign unplace *
		Remove all placed signs in the global group from all the files.

:sign unplace * group={group}
		Remove all placed signs in group {group} from all the files.

:sign unplace * group=*
		Remove all placed signs in all the groups from all the files.

:sign unplace
		Remove a placed sign at the cursor position. If multiple signs
		are placed in the line, then only one is removed.

:sign unplace group={group}
		Remove a placed sign in group {group} at the cursor
		position.

:sign unplace group=*
		Remove a placed sign in any group at the cursor position.


LISTING PLACED SIGNS					*:sign-place-list*

See |sign_getplaced()| for the equivalent Vim script function.

:sign place file={fname}
		List signs placed in file {fname}.
		See remark above about {fname} |:sign-fname|.

:sign place group={group} file={fname}
		List signs in group {group} placed in file {fname}.

:sign place group=* file={fname}
		List signs in all the groups placed in file {fname}.

:sign place buffer={nr}
		List signs placed in buffer {nr}.

:sign place group={group} buffer={nr}
		List signs in group {group} placed in buffer {nr}.

:sign place group=* buffer={nr}
		List signs in all the groups placed in buffer {nr}.

:sign place	List placed signs in the global group in all files.

:sign place group={group}
		List placed signs with sign group {group} in all files.

:sign place group=*
		List placed signs in all sign groups in all files.


JUMPING TO A SIGN					*:sign-jump* *E157*

See |sign_jump()| for the equivalent Vim script function.

:sign jump {id} file={fname}
		Open the file {fname} or jump to the window that contains
		{fname} and position the cursor at sign {id}.
		See remark above about {fname} |:sign-fname|.
		If the file isn't displayed in window and the current file can
		not be |abandon|ed this fails.

:sign jump {id} group={group} file={fname}
		Same but jump to the sign in group {group}

:sign jump {id} [buffer={nr}]					*E934*
		Same, but use buffer {nr}.  This fails if buffer {nr} does not
		have a name. If the buffer argument is not given, use the
		current buffer.

:sign jump {id} group={group} [buffer={nr}]
		Same but jump to the sign in group {group}


==============================================================================
3. Functions					*sign-functions-details*

sign_define({name} [, {dict}])				*sign_define()*
sign_define({list})
		Define a new sign named {name} or modify the attributes of an
		existing sign.  This is similar to the |:sign-define| command.

		Prefix {name} with a unique text to avoid name collisions.
		There is no {group} like with placing signs.

		The {name} can be a String or a Number.  The optional {dict}
		argument specifies the sign attributes.  The following values
		are supported:
		   icon		full path to the bitmap file for the sign.
		   linehl	highlight group used for the whole line the
				sign is placed in.
		   priority	default priority value of the sign
		   numhl	highlight group used for the line number where
				the sign is placed.
		   text		text that is displayed when there is no icon
				or the GUI is not being used.
		   texthl	highlight group used for the text item
		   culhl	highlight group used for the text item when
				the cursor is on the same line as the sign and
				'cursorline' is enabled.

		If the sign named {name} already exists, then the attributes
		of the sign are updated.

		The one argument {list} can be used to define a list of signs.
		Each list item is a dictionary with the above items in {dict}
		and a "name" item for the sign name.

		Returns 0 on success and -1 on failure.  When the one argument
		{list} is used, then returns a List of values one for each
		defined sign.

		Examples: >
			call sign_define("mySign", {
				\ "text" : "=>",
				\ "texthl" : "Error",
				\ "linehl" : "Search"})
			call sign_define([
				\ {'name' : 'sign1',
				\  'text' : '=>'},
				\ {'name' : 'sign2',
				\  'text' : '!!'}
				\ ])
<
		Can also be used as a |method|: >
			GetSignList()->sign_define()
<
		Return type: |Number|


sign_getdefined([{name}])				*sign_getdefined()*
		Get a list of defined signs and their attributes.
		This is similar to the |:sign-list| command.

		If the {name} is not supplied, then a list of all the defined
		signs is returned. Otherwise the attribute of the specified
		sign is returned.

		Each list item in the returned value is a dictionary with the
		following entries:
		   icon		full path to the bitmap file of the sign
		   linehl	highlight group used for the whole line the
				sign is placed in; not present if not set
		   name		name of the sign
		   priority	default priority value of the sign
		   numhl	highlight group used for the line number where
				the sign is placed; not present if not set
		   text		text that is displayed when there is no icon
				or the GUI is not being used.
		   texthl	highlight group used for the text item; not
				present if not set
		   culhl	highlight group used for the text item when
				the cursor is on the same line as the sign and
				'cursorline' is enabled; not present if not
				set

		Returns an empty List if there are no signs and when {name} is
		not found.

		Examples: >
			" Get a list of all the defined signs
			echo sign_getdefined()

			" Get the attribute of the sign named mySign
			echo sign_getdefined("mySign")
<
		Can also be used as a |method|: >
			GetSignList()->sign_getdefined()
<
		Return type: list<dict<string>> or list<any>


sign_getplaced([{buf} [, {dict}]])			*sign_getplaced()*
		Return a list of signs placed in a buffer or all the buffers.
		This is similar to the |:sign-place-list| command.

		If the optional buffer name {buf} is specified, then only the
		list of signs placed in that buffer is returned.  For the use
		of {buf}, see |bufname()|. The optional {dict} can contain
		the following entries:
		   group	select only signs in this group
		   id		select sign with this identifier
		   lnum		select signs placed in this line. For the use
				of {lnum}, see |line()|.
		If {group} is '*', then signs in all the groups including the
		global group are returned. If {group} is not supplied or is an
		empty string, then only signs in the global group are
		returned.  If no arguments are supplied, then signs in the
		global group placed in all the buffers are returned.
		See |sign-group|.

		Each list item in the returned value is a dictionary with the
		following entries:
			bufnr	number of the buffer with the sign
			signs	list of signs placed in {bufnr}. Each list
				item is a dictionary with the below listed
				entries

		The dictionary for each sign contains the following entries:
			group	 sign group. Set to '' for the global group.
			id	 identifier of the sign
			lnum	 line number where the sign is placed
			name	 name of the defined sign
			priority sign priority

		The returned signs in a buffer are ordered by their line
		number and priority.

		Returns an empty list on failure or if there are no placed
		signs.

		Examples: >
			" Get a List of signs placed in eval.c in the
			" global group
			echo sign_getplaced("eval.c")

			" Get a List of signs in group 'g1' placed in eval.c
			echo sign_getplaced("eval.c", {'group' : 'g1'})

			" Get a List of signs placed at line 10 in eval.c
			echo sign_getplaced("eval.c", {'lnum' : 10})

			" Get sign with identifier 10 placed in a.py
			echo sign_getplaced("a.py", {'id' : 10})

			" Get sign with id 20 in group 'g1' placed in a.py
			echo sign_getplaced("a.py", {'group' : 'g1',
							\  'id' : 20})

			" Get a List of all the placed signs
			echo sign_getplaced()
<
		Can also be used as a |method|: >
			GetBufname()->sign_getplaced()
<
		Return type: list<dict<any>>


sign_jump({id}, {group}, {buf})				*sign_jump()*
		Open the buffer {buf} or jump to the window that contains
		{buf} and position the cursor at sign {id} in group {group}.
		This is similar to the |:sign-jump| command.

		If {group} is an empty string, then the global group is used.
		For the use of {buf}, see |bufname()|.

		Returns the line number of the sign. Returns -1 if the
		arguments are invalid.

		Example: >
			" Jump to sign 10 in the current buffer
			call sign_jump(10, '', '')
<
		Can also be used as a |method|: >
			GetSignid()->sign_jump()
<
		Return type: |Number|


							*sign_place()*
sign_place({id}, {group}, {name}, {buf} [, {dict}])
		Place the sign defined as {name} at line {lnum} in file or
		buffer {buf} and assign {id} and {group} to sign.  This is
		similar to the |:sign-place| command.

		If the sign identifier {id} is zero, then a new identifier is
		allocated.  Otherwise the specified number is used. {group} is
		the sign group name. To use the global sign group, use an
		empty string.  {group} functions as a namespace for {id}, thus
		two groups can use the same IDs. Refer to |sign-identifier|
		and |sign-group| for more information.

		{name} refers to a defined sign.
		{buf} refers to a buffer name or number. For the accepted
		values, see |bufname()|.

		The optional {dict} argument supports the following entries:
			lnum		line number in the file or buffer
					{buf} where the sign is to be placed.
					For the accepted values, see |line()|.
			priority	priority of the sign. See
					|sign-priority| for more information.

		If the optional {dict} is not specified, then it modifies the
		placed sign {id} in group {group} to use the defined sign
		{name}.

		Returns the sign identifier on success and -1 on failure.

		Examples: >
			" Place a sign named sign1 with id 5 at line 20 in
			" buffer json.c
			call sign_place(5, '', 'sign1', 'json.c',
							\ {'lnum' : 20})

			" Updates sign 5 in buffer json.c to use sign2
			call sign_place(5, '', 'sign2', 'json.c')

			" Place a sign named sign3 at line 30 in
			" buffer json.c with a new identifier
			let id = sign_place(0, '', 'sign3', 'json.c',
							\ {'lnum' : 30})

			" Place a sign named sign4 with id 10 in group 'g3'
			" at line 40 in buffer json.c with priority 90
			call sign_place(10, 'g3', 'sign4', 'json.c',
					\ {'lnum' : 40, 'priority' : 90})
<
		Can also be used as a |method|: >
			GetSignid()->sign_place(group, name, expr)
<
		Return type: |Number|


sign_placelist({list})				*sign_placelist()*
		Place one or more signs.  This is similar to the
		|sign_place()| function.  The {list} argument specifies the
		List of signs to place. Each list item is a dict with the
		following sign attributes:
		    buffer	Buffer name or number. For the accepted
				values, see |bufname()|.
		    group	Sign group. {group} functions as a namespace
				for {id}, thus two groups can use the same
				IDs. If not specified or set to an empty
				string, then the global group is used.   See
				|sign-group| for more information.
		    id		Sign identifier. If not specified or zero,
				then a new unique identifier is allocated.
				Otherwise the specified number is used. See
				|sign-identifier| for more information.
		    lnum	Line number in the buffer where the sign is to
				be placed. For the accepted values, see
				|line()|.
		    name	Name of the sign to place. See |sign_define()|
				for more information.
		    priority	Priority of the sign. When multiple signs are
				placed on a line, the sign with the highest
				priority is used. If not specified, the
				default value of 10 is used, unless specified
				otherwise by the sign definition. See
				|sign-priority| for more information.

		If {id} refers to an existing sign, then the existing sign is
		modified to use the specified {name} and/or {priority}.

		Returns a List of sign identifiers. If failed to place a
		sign, the corresponding list item is set to -1.

		Examples: >
			" Place sign s1 with id 5 at line 20 and id 10 at line
			" 30 in buffer a.c
			let [n1, n2] = sign_placelist([
				\ {'id' : 5,
				\  'name' : 's1',
				\  'buffer' : 'a.c',
				\  'lnum' : 20},
				\ {'id' : 10,
				\  'name' : 's1',
				\  'buffer' : 'a.c',
				\  'lnum' : 30}
				\ ])

			" Place sign s1 in buffer a.c at line 40 and 50
			" with auto-generated identifiers
			let [n1, n2] = sign_placelist([
				\ {'name' : 's1',
				\  'buffer' : 'a.c',
				\  'lnum' : 40},
				\ {'name' : 's1',
				\  'buffer' : 'a.c',
				\  'lnum' : 50}
				\ ])
<
		Can also be used as a |method|: >
			GetSignlist()->sign_placelist()
<
		Return type: |Number|


sign_undefine([{name}])					*sign_undefine()*
sign_undefine({list})
		Deletes a previously defined sign {name}. This is similar to
		the |:sign-undefine| command. If {name} is not supplied, then
		deletes all the defined signs.

		The one argument {list} can be used to undefine a list of
		signs. Each list item is the name of a sign.

		Returns 0 on success and -1 on failure.  For the one argument
		{list} call, returns a list of values one for each undefined
		sign.

		Examples: >
			" Delete a sign named mySign
			call sign_undefine("mySign")

			" Delete signs 'sign1' and 'sign2'
			call sign_undefine(["sign1", "sign2"])

			" Delete all the signs
			call sign_undefine()
<
		Can also be used as a |method|: >
			GetSignlist()->sign_undefine()
<
		Return type: |Number|


sign_unplace({group} [, {dict}])			*sign_unplace()*
		Remove a previously placed sign in one or more buffers.  This
		is similar to the |:sign-unplace| command.

		{group} is the sign group name. To use the global sign group,
		use an empty string.  If {group} is set to '*', then all the
		groups including the global group are used.
		The signs in {group} are selected based on the entries in
		{dict}.  The following optional entries in {dict} are
		supported:
			buffer	buffer name or number. See |bufname()|.
			id	sign identifier
		If {dict} is not supplied, then all the signs in {group} are
		removed.

		Returns 0 on success and -1 on failure.

		Examples: >
			" Remove sign 10 from buffer a.vim
			call sign_unplace('', {'buffer' : "a.vim", 'id' : 10})

			" Remove sign 20 in group 'g1' from buffer 3
			call sign_unplace('g1', {'buffer' : 3, 'id' : 20})

			" Remove all the signs in group 'g2' from buffer 10
			call sign_unplace('g2', {'buffer' : 10})

			" Remove sign 30 in group 'g3' from all the buffers
			call sign_unplace('g3', {'id' : 30})

			" Remove all the signs placed in buffer 5
			call sign_unplace('*', {'buffer' : 5})

			" Remove the signs in group 'g4' from all the buffers
			call sign_unplace('g4')

			" Remove sign 40 from all the buffers
			call sign_unplace('*', {'id' : 40})

			" Remove all the placed signs from all the buffers
			call sign_unplace('*')

<		Can also be used as a |method|: >
			GetSigngroup()->sign_unplace()
<
		Return type: |Number|


sign_unplacelist({list})				*sign_unplacelist()*
		Remove previously placed signs from one or more buffers.  This
		is similar to the |sign_unplace()| function.

		The {list} argument specifies the List of signs to remove.
		Each list item is a dict with the following sign attributes:
		    buffer	buffer name or number. For the accepted
				values, see |bufname()|. If not specified,
				then the specified sign is removed from all
				the buffers.
		    group	sign group name. If not specified or set to an
				empty string, then the global sign group is
				used. If set to '*', then all the groups
				including the global group are used.
		    id		sign identifier. If not specified, then all
				the signs in the specified group are removed.

		Returns a List where an entry is set to 0 if the corresponding
		sign was successfully removed or -1 on failure.

		Example: >
			" Remove sign with id 10 from buffer a.vim and sign
			" with id 20 from buffer b.vim
			call sign_unplacelist([
				\ {'id' : 10, 'buffer' : "a.vim"},
				\ {'id' : 20, 'buffer' : 'b.vim'},
				\ ])
<
		Can also be used as a |method|: >
			GetSignlist()->sign_unplacelist()
<
		Return type: list<number> or list<any>

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