patch 8.1.1426: no test for syntax highlight in popup window

Problem:    No test for syntax highlight in popup window.
Solution:   Add a screenshot test.  Update associated documentation. Avoid
            'buftype' being reset by setbufvar().

runtime/doc/eval.txt

@@ -1,4 +1,4 @@
-*eval.txt*	For Vim version 8.1.  Last change: 2019 May 25
+*eval.txt*	For Vim version 8.1.  Last change: 2019 May 30
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -2087,12 +2087,12 @@ v:t_blob	Value of |Blob| type.  Read-only.  See: |type()|
 				*v:termresponse* *termresponse-variable*
 v:termresponse	The escape sequence returned by the terminal for the |t_RV|
 		termcap entry.  It is set when Vim receives an escape sequence
-		that starts with ESC [ or CSI and ends in a 'c', with only
-		digits, ';' and '.' in between.
+		that starts with ESC [ or CSI, then '>' or '?' and ends in a
+		'c', with only digits and ';' in between.
 		When this option is set, the TermResponse autocommand event is
 		fired, so that you can react to the response from the
 		terminal.
-		The response from a new xterm is: "<Esc>[ Pp ; Pv ; Pc c".  Pp
+		The response from a new xterm is: "<Esc>[> Pp ; Pv ; Pc c".  Pp
 		is the terminal type: 0 for vt100 and 1 for vt220.  Pv is the
 		patch level (since this was introduced in patch 95, it's
 		always 95 or bigger).  Pc is always zero.
@@ -8400,6 +8400,8 @@ setreg({regname}, {value} [, {options}])
 settabvar({tabnr}, {varname}, {val})			*settabvar()*
 		Set tab-local variable {varname} to {val} in tab page {tabnr}.
 		|t:var|
+		Note that autocommands are blocked, side effects may not be
+		triggered, e.g. when setting 'filetype'.
 		Note that the variable name without "t:" must be used.
 		Tabs are numbered starting with one.
 		This function is not available in the |sandbox|.
@@ -8411,6 +8413,8 @@ settabwinvar({tabnr}, {winnr}, {varname}, {val})	*settabwinvar()*
 		use |setwinvar()|.
 		{winnr} can be the window number or the |window-ID|.
 		When {winnr} is zero the current window is used.
+		Note that autocommands are blocked, side effects may not be
+		triggered, e.g. when setting 'filetype' or 'syntax'.
 		This also works for a global or local buffer option, but it
 		doesn't work for a global or local buffer variable.
 		For a local buffer option the global value is unchanged.
@@ -10318,9 +10322,13 @@ wildmenumode()					*wildmenumode()*
 win_execute({id}, {command} [, {silent}])		*win_execute()*
 		Like `execute()` but in the context of window {id}.
 		The window will temporarily be made the current window,
-		without triggering autocommands.
+		without triggering autocommands.  When executing {command}
+		autocommands will be triggered, this may have unexpected side
+		effects.  Use |:noautocmd| if needed.
 		Example: >
-			call win_execute(winid, 'syntax enable')
+			call win_execute(winid, 'set syntax=python')
+<		Doing the same with `setwinvar()` would not trigger
+		autocommands and not actually show syntax highlighting.
 
 win_findbuf({bufnr})					*win_findbuf()*
 		Returns a list with |window-ID|s for windows that contain

src/testdir/dumps/Test_popupwin_10.dump

@@ -0,0 +1,10 @@
+>1+0&#ffffff0| @73
+|2| @73
+|3| @22|#+0#e000e06#5fd7ff255|i|n|c|l|u|d|e| |<+0#e000002&|s|t|d|i|o|.|h|>| +0#0000000#ffffff0@32
+|4| @22|i+0#00e0003#5fd7ff255|n|t| +0#0000000&|m|a|i|n|(|v+0#00e0003&|o|i|d|)+0#0000000&| @3| +0&#ffffff0@32
+|5| @22|{+0&#5fd7ff255| @16| +0&#ffffff0@32
+|6| @22| +0&#5fd7ff255@3|p|r|i|n|t|f|(|1+0#e000002&|2|3|)+0#0000000&|;| @1| +0&#ffffff0@32
+|7| @22|}+0&#5fd7ff255| @16| +0&#ffffff0@32
+|8| @73
+|9| @73
+@57|1|,|1| @10|T|o|p| 

src/testdir/dumps/Test_popupwin_11.dump

@@ -0,0 +1,10 @@
+>1+0&#ffffff0| @73
+|2| @73
+|3| @18|#+0#e000e06#e0e0e08|i|n|c|l|u|d|e| |<+0#e000002&|s|t|d|i|o|.|h|>| +0#0000000#ffffff0@36
+|4| @18|i+0#00e0003#e0e0e08|n|t| +0#0000000&|m|a|i|n|(|v+0#00e0003&|o|i|d|)+0#0000000&| @3| +0&#ffffff0@36
+|5| @18|{+0&#e0e0e08| @16| +0&#ffffff0@36
+|6| @18| +0&#e0e0e08@3|p|r|i|n|t|f|(|5+0#e000002&|6|7|)+0#0000000&|;| @1| +0&#ffffff0@36
+|7| @18|}+0&#e0e0e08| @16| +0&#ffffff0@36
+|8| @73
+|9| @73
+@57|1|,|1| @10|T|o|p| 

src/testdir/test_popupwin.vim

@@ -56,6 +56,54 @@ func Test_simple_popup()
   call delete('XtestPopup')
 endfunc
 
+func Test_popup_with_syntax_win_execute()
+  if !CanRunVimInTerminal()
+    return
+  endif
+  call writefile([
+	\ "call setline(1, range(1, 100))",
+	\ "hi PopupColor ctermbg=lightblue",
+	\ "let winid = popup_create([",
+	\ "\\ '#include <stdio.h>',",
+	\ "\\ 'int main(void)',",
+	\ "\\ '{',",
+	\ "\\ '    printf(123);',",
+	\ "\\ '}',",
+	\ "\\], {'line': 3, 'col': 25, 'highlight': 'PopupColor'})",
+	\ "call win_execute(winid, 'set syntax=cpp')",
+	\], 'XtestPopup')
+  let buf = RunVimInTerminal('-S XtestPopup', {'rows': 10})
+  call VerifyScreenDump(buf, 'Test_popupwin_10', {})
+
+  " clean up
+  call StopVimInTerminal(buf)
+  call delete('XtestPopup')
+endfunc
+
+func Test_popup_with_syntax_setbufvar()
+  if !CanRunVimInTerminal()
+    return
+  endif
+  call writefile([
+	\ "call setline(1, range(1, 100))",
+	\ "hi PopupColor ctermbg=lightgrey",
+	\ "let winid = popup_create([",
+	\ "\\ '#include <stdio.h>',",
+	\ "\\ 'int main(void)',",
+	\ "\\ '{',",
+	\ "\\ '    printf(567);',",
+	\ "\\ '}',",
+	\ "\\], {'line': 3, 'col': 21, 'highlight': 'PopupColor'})",
+	\ "call setbufvar(winbufnr(winid), '&syntax', 'cpp')",
+	\], 'XtestPopup')
+  let buf = RunVimInTerminal('-S XtestPopup', {'rows': 10})
+  call VerifyScreenDump(buf, 'Test_popupwin_11', {})
+
+  " clean up
+  call StopVimInTerminal(buf)
+  call delete('XtestPopup')
+endfunc
+
 func Test_popup_time()
   if !has('timers')
     return

src/version.c

@@ -767,6 +767,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1426,
 /**/
     1425,
 /**/