Merge from origin/emacs-27

2c5f215419 Avoid crashes in Mew due to corrupted tool-bar label
7a23915618 * lisp/tooltip.el (tooltip): Doc fix for GTK.
c4bbe02cc4 * lisp/help.el (help-for-help-internal): Doc fix; use impe...

# Conflicts:
#	lisp/help.el
#	lisp/tooltip.el

1 files changed, 14 insertions, 8 deletions

diff --git a/src/gtkutil.c b/src/gtkutil.c
index 11e59b9fae5..4634c35dd4c 100644
--- a/src/gtkutil.c
+++ b/src/gtkutil.c
@@ -5014,11 +5014,10 @@ update_frame_tool_bar (struct frame *f)
       GtkWidget *wbutton = NULL;
       Lisp_Object specified_file;
       bool vert_only = ! NILP (PROP (TOOL_BAR_ITEM_VERT_ONLY));
-      const char *label
-        = (EQ (style, Qimage) || (vert_only && horiz)) ? NULL
-        : STRINGP (PROP (TOOL_BAR_ITEM_LABEL))
-        ? SSDATA (PROP (TOOL_BAR_ITEM_LABEL))
-        : "";
+      Lisp_Object label
+        = (EQ (style, Qimage) || (vert_only && horiz))
+        ? Qnil
+        : PROP (TOOL_BAR_ITEM_LABEL);
 
       ti = gtk_toolbar_get_nth_item (GTK_TOOLBAR (wtoolbar), j);
 
@@ -5131,8 +5130,11 @@ update_frame_tool_bar (struct frame *f)
 
       /* If there is an existing widget, check if it's stale; if so,
          remove it and make a new tool item from scratch.  */
-      if (ti && xg_tool_item_stale_p (wbutton, stock_name, icon_name,
-                                      img, label, horiz))
+      if (ti && xg_tool_item_stale_p (wbutton, stock_name, icon_name, img,
+                                      NILP (label)
+                                      ? NULL
+                                      : STRINGP (label) ? SSDATA (label) : "",
+                                      horiz))
         {
           gtk_container_remove (GTK_CONTAINER (wtoolbar),
                                 GTK_WIDGET (ti));
@@ -5189,7 +5191,11 @@ update_frame_tool_bar (struct frame *f)
 #else
           if (w) gtk_misc_set_padding (GTK_MISC (w), hmargin, vmargin);
 #endif
-          ti = xg_make_tool_item (f, w, &wbutton, label, i, horiz, text_image);
+          ti = xg_make_tool_item (f, w, &wbutton,
+                                  NILP (label)
+                                  ? NULL
+                                  : STRINGP (label) ? SSDATA (label) : "",
+                                  i, horiz, text_image);
           gtk_toolbar_insert (GTK_TOOLBAR (wtoolbar), ti, j);
         }