patch 8.1.1799: cannot avoid mapping for a popup window

Problem:    Cannot avoid mapping for a popup window.
Solution:   Add the "mapping" property, default TRUE.

runtime/doc/popup.txt

@@ -246,6 +246,7 @@ popup_dialog({what}, {options})				*popup_dialog()*
 				\ drag: 1,
 				\ border: [],
 				\ padding: [],
+				\ mapping: 0,
 				\})
 <		Use {options} to change the properties. E.g. add a 'filter'
 		option with value 'popup_filter_yesno'.  Example: >
@@ -369,12 +370,20 @@ popup_menu({what}, {options})				 *popup_menu()*
 				\ cursorline: 1,
 				\ padding: [0,1,0,1],
 				\ filter: 'popup_filter_menu',
+				\ mapping: 0,
 				\ })
 <		The current line is highlighted with a match using
 		"PopupSelected", or "PmenuSel" if that is not defined.
 
 		Use {options} to change the properties.  Should at least set
 		"callback" to a function that handles the selected item.
+		Example: >
+			func ColorSelected(id, result)
+			   " use a:result
+			endfunc
+			call popup_menu(['red', 'green', 'blue'], #{
+				\ callback: 'ColorSelected',
+				\ })
 
 
 popup_move({id}, {options})					*popup_move()*
@@ -433,16 +442,17 @@ popup_setoptions({id}, {options})			*popup_setoptions()*
 			borderhighlight
 			callback
 			close
-			drag
-			resize
 			cursorline
+			drag
 			filter
 			firstline
 			flip
 			highlight
+			mapping
 			mask
 			moved
 			padding
+			resize
 			scrollbar
 			scrollbarhighlight
 			thumbhighlight
@@ -615,6 +625,9 @@ The second argument of |popup_create()| is a dictionary with options:
 			Default is zero, except for |popup_menu()|.
 	filter		A callback that can filter typed characters, see
 			|popup-filter|.
+	mapping		Allow for key mapping.  When FALSE and the popup is
+			visible and has a filter callback key mapping is
+			disabled.  Default value is TRUE.
 	callback	A callback that is called when the popup closes, e.g.
 			when using |popup_filter_menu()|, see |popup-callback|.
 
@@ -671,8 +684,11 @@ key as a string, e.g.: >
 	  endif
 	  return 0
 	endfunc
-
+<							*popup-mapping*
-Currently the key is what results after any mapping.  This may change...
+Normally the key is what results after any mapping, since the keys pass on as
+normal input if the filter does not use it.  If the filter consumes all the
+keys, set the "mapping" property to zero so that mappings do not get in the
+way.  This is default for |popup_menu()| and |popup_dialog()|.
 
 Some common key actions:
 	x		close the popup (see note below)
@@ -703,6 +719,11 @@ the second argument of `popup_close()`.
 If the popup is force-closed, e.g. because the cursor moved or CTRL-C was
 pressed, the number -1 is passed to the callback.
 
+Example: >
+	func SelectedColor(id, result)
+	   echo 'choice made: ' .. a:result
+	endfunc
+
 
 POPUP SCROLLBAR						*popup-scrollbar*
 

src/getchar.c

@@ -1574,6 +1574,9 @@ vgetc(void)
 	    if (mod_mask
 #if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
 		    || im_is_preediting()
+#endif
+#if defined(FEAT_TEXT_PROP)
+		    || popup_no_mapping()
 #endif
 		    )
 	    {

src/popupwin.c

@@ -800,6 +800,15 @@ apply_general_options(win_T *wp, dict_T *dict)
 	    set_callback(&wp->w_filter_cb, &callback);
 	}
     }
+    di = dict_find(dict, (char_u *)"mapping", -1);
+    if (di != NULL)
+    {
+	nr = dict_get_number(dict, (char_u *)"mapping");
+	if (nr)
+	    wp->w_popup_flags |= POPF_MAPPING;
+	else
+	    wp->w_popup_flags &= ~POPF_MAPPING;
+    }
 
     di = dict_find(dict, (char_u *)"callback", -1);
     if (di != NULL)
@@ -1413,7 +1422,7 @@ popup_create(typval_T *argvars, typval_T *rettv, create_type_T type)
     if (rettv != NULL)
 	rettv->vval.v_number = wp->w_id;
     wp->w_popup_pos = POPPOS_TOPLEFT;
-    wp->w_popup_flags = POPF_IS_POPUP;
+    wp->w_popup_flags = POPF_IS_POPUP | POPF_MAPPING;
 
     if (buf != NULL)
     {
@@ -1561,6 +1570,7 @@ popup_create(typval_T *argvars, typval_T *rettv, create_type_T type)
 	wp->w_popup_pos = POPPOS_CENTER;
 	wp->w_zindex = POPUPWIN_DIALOG_ZINDEX;
 	wp->w_popup_flags |= POPF_DRAG;
+	wp->w_popup_flags &= ~POPF_MAPPING;
 	for (i = 0; i < 4; ++i)
 	{
 	    wp->w_popup_border[i] = 1;
@@ -2501,6 +2511,25 @@ popup_do_filter(int c)
     return res;
 }
 
+/*
+ * Return TRUE if there is a popup visible with a filter callback and the
+ * "mapping" property off.
+ */
+    int
+popup_no_mapping(void)
+{
+    int	    round;
+    win_T   *wp;
+
+    for (round = 1; round <= 2; ++round)
+	for (wp = round == 1 ? first_popupwin : curtab->tp_first_popupwin;
+						   wp != NULL; wp = wp->w_next)
+	    if (wp->w_filter_cb.cb_name != NULL
+		    && (wp->w_popup_flags & (POPF_HIDDEN | POPF_MAPPING)) == 0)
+		return TRUE;
+    return FALSE;
+}
+
 /*
  * Called when the cursor moved: check if any popup needs to be closed if the
  * cursor moved far enough.

src/proto/popupwin.pro

@@ -38,6 +38,7 @@ int error_if_popup_window(void);
 void popup_reset_handled(void);
 win_T *find_next_popup(int lowest);
 int popup_do_filter(int c);
+int popup_no_mapping(void);
 void popup_check_cursor_pos(void);
 void may_update_popup_mask(int type);
 void update_popups(void (*win_update)(win_T *wp));

src/testdir/test_popupwin.vim

@@ -657,6 +657,7 @@ func Test_popup_invalid_arguments()
   call assert_fails('call popup_create("text", #{mask: ["asdf"]})', 'E475:')
   call popup_clear()
   call assert_fails('call popup_create("text", #{mask: test_null_list()})', 'E475:')
+  call assert_fails('call popup_create("text", #{mapping: []})', 'E745:')
   call popup_clear()
 endfunc
 
@@ -1203,6 +1204,8 @@ func Test_popup_menu()
     let s:cb_winid = a:id
     let s:cb_res = a:res
   endfunc
+  " mapping won't be used in popup
+  map j k
 
   let winid = ShowMenu(" ", 1)
   let winid = ShowMenu("j \<CR>", 2)
@@ -1215,6 +1218,7 @@ func Test_popup_menu()
   let winid = ShowMenu("\<C-C>", -1)
 
   delfunc QuitCallback
+  unmap j
 endfunc
 
 func Test_popup_menu_screenshot()
@@ -2194,6 +2198,9 @@ func Test_previewpopup()
   call term_sendkeys(buf, "/another\<CR>\<C-W>}")
   call VerifyScreenDump(buf, 'Test_popupwin_previewpopup_4', {})
 
+  call term_sendkeys(buf, ":cd ..\<CR>:\<CR>")
+  call VerifyScreenDump(buf, 'Test_popupwin_previewpopup_5', {})
+
   call StopVimInTerminal(buf)
   call delete('Xtags')
   call delete('Xtagfile')

src/version.c

@@ -773,6 +773,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1799,
 /**/
     1798,
 /**/

src/vim.h

@@ -621,6 +621,7 @@ extern int (*dyn_libintl_wputenv)(const wchar_t *envstring);
 #define POPF_ON_CMDLINE	0x10	// popup overlaps command line
 #define POPF_DRAG	0x20	// popup can be moved by dragging
 #define POPF_RESIZE	0x40	// popup can be resized by dragging
+#define POPF_MAPPING	0x80	// mapping keys
 
 #ifdef FEAT_TEXT_PROP
 # define WIN_IS_POPUP(wp) ((wp)->w_popup_flags != 0)