master e99f41f03a: Fix recalculation of `icon-title-format' after a frame is iconified

[Po Lu]

branch: master
commit e99f41f03a97641ee05ba4a27f8b91c190f55df1
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Fix recalculation of `icon-title-format' after a frame is iconified
    
    Previously it would only happen upon the next mode line
    redisplay, meaning that just pressing C-z would not update the
    implicit title, since C-z doesn't cause a redisplay.
    
    * src/dispextern.h: Update prototypes.
    * src/frame.h (SET_FRAME_ICONIFIED): De-slugify.  Call
    `gui_consider_frame_title', since `icon-title-format' might be
    different from the current frame title.
    * src/xdisp.c (gui_consider_frame_title): Export (also in
    dispextern.h).  (bug#55850)
---
 src/dispextern.h |  1 +
 src/frame.h      | 24 ++++++++++++++++++++++--
 src/xdisp.c      |  2 +-
 3 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/src/dispextern.h b/src/dispextern.h
index 910f630a50..c7399ca299 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -3470,6 +3470,7 @@ extern void expose_frame (struct frame *, int, int, int, 
int);
 extern bool gui_intersect_rectangles (const Emacs_Rectangle *,
                                       const Emacs_Rectangle *,
                                       Emacs_Rectangle *);
+extern void gui_consider_frame_title (Lisp_Object);
 #endif /* HAVE_WINDOW_SYSTEM */
 
 extern void note_mouse_highlight (struct frame *, int, int);
diff --git a/src/frame.h b/src/frame.h
index a164853e09..458b6257e4 100644
--- a/src/frame.h
+++ b/src/frame.h
@@ -1293,8 +1293,28 @@ SET_FRAME_VISIBLE (struct frame *f, int v)
 }
 
 /* Set iconified status of frame F.  */
-#define SET_FRAME_ICONIFIED(f, i)                              \
-  (f)->iconified = (eassert (0 <= (i) && (i) <= 1), (i))
+INLINE void
+SET_FRAME_ICONIFIED (struct frame *f, int i)
+{
+#ifdef HAVE_WINDOW_SYSTEM
+  Lisp_Object frame;
+#endif
+
+  eassert (0 <= (i) && (i) <= 1);
+
+  f->iconified = i;
+
+#ifdef HAVE_WINDOW_SYSTEM
+  /* Iconifying a frame might cause the frame title to change if no
+     title was explicitly specified.  Force the frame title to be
+     recomputed.  */
+
+  XSETFRAME (frame, f);
+
+  if (FRAME_WINDOW_P (f))
+    gui_consider_frame_title (frame);
+#endif
+}
 
 extern Lisp_Object selected_frame;
 extern Lisp_Object old_selected_frame;
diff --git a/src/xdisp.c b/src/xdisp.c
index 07324815d9..2245326b0d 100644
--- a/src/xdisp.c
+++ b/src/xdisp.c
@@ -13148,7 +13148,7 @@ store_mode_line_noprop (const char *string, int 
field_width, int precision)
    Vicon_title_format if FRAME is iconified, otherwise it is
    frame_title_format.  */
 
-static void
+void
 gui_consider_frame_title (Lisp_Object frame)
 {
   struct frame *f = XFRAME (frame);