Replace NS code that implemented font panels in a different way

* doc/emacs/macos.texi (Mac / GNUstep Events): Document removal
of `ns-change-font' event.  The font panels are now implemented
normally, via `x-select-font'.

* lisp/term/common-win.el (x-setup-function-keys): Likewise.

* lisp/term/ns-win.el (global-map, ns-popup-font-panel): Remove.
(x-select-font, mouse-set-font, ns-input-font):
(ns-input-fontsize): Remove.
(ns-respond-to-change-font): Delete function.

* src/nsfns.m (Fns_popup_font_panel): Delete function.
(Fx_select_font): New function.
(syms_of_nsfns): Update subrs.
* src/nsterm.h (@interface EmacsView):
* src/nsterm.m (ns_select_1): New function.
(ns_select): Wrap around that instead.
([EmacsView changeFont:]): Exit nested event loop
([EmacsView showFontPanel:]): New function.

doc/emacs/macos.texi

@@ -273,14 +273,6 @@ application is overriding the default behavior.
 The modifier keys listed above are defined by macOS and are unaffected
 by user changes to the modifiers in Emacs.
 
-@item ns-change-font
-This event occurs when the user selects a font in a Nextstep font
-panel (which can be opened with @kbd{Cmd-t}).  The default behavior is
-to adjust the font of the selected frame
-(@code{ns-respond-to-changefont}).  The name and size of the selected
-font are stored in the variables @code{ns-input-font} and
-@code{ns-input-fontsize}, respectively.
-
 @item ns-power-off
 This event occurs when the user logs out and Emacs is still running, or when
 ``Quit Emacs'' is chosen from the application menu.

lisp/term/common-win.el

@@ -65,7 +65,6 @@
 	       (cons  4 'ns-drag-file)
 	       (cons  5 'ns-drag-color)
 	       (cons  6 'ns-drag-text)
-	       (cons  7 'ns-change-font)
 	       (cons  8 'ns-open-file-line)
 ;;;	       (cons  9 'ns-insert-working-text)
 ;;;	       (cons 10 'ns-delete-working-text)

lisp/term/ns-win.el

@@ -176,7 +176,6 @@ The properties returned may include `top', `left', `height', and `width'."
 (define-key global-map [ns-power-off] 'save-buffers-kill-emacs)
 (define-key global-map [ns-open-file] 'ns-find-file)
 (define-key global-map [ns-open-temp-file] [ns-open-file])
-(define-key global-map [ns-change-font] 'ns-respond-to-change-font)
 (define-key global-map [ns-open-file-line] 'ns-open-file-select-line)
 (define-key global-map [ns-spi-service-call] 'ns-spi-service-call)
 (define-key global-map [ns-new-frame] 'make-frame)
@@ -623,34 +622,6 @@ If FRAME is nil, the change applies to the selected frame."
 ;; Needed for font listing functions under both backend and normal
 (setq scalable-fonts-allowed t)
 
-;; Set to use font panel instead
-(declare-function ns-popup-font-panel "nsfns.m" (&optional frame))
-(defalias 'x-select-font 'ns-popup-font-panel "Pop up the font panel.
-This function has been overloaded in Nextstep.")
-(defalias 'mouse-set-font 'ns-popup-font-panel "Pop up the font panel.
-This function has been overloaded in Nextstep.")
-
-;; nsterm.m
-(defvar ns-input-font)
-(defvar ns-input-fontsize)
-
-(defun ns-respond-to-change-font ()
-  "Set the font chosen in the font-picker panel.
-Respond to changeFont: event, expecting ns-input-font and
-ns-input-fontsize of new font."
-  (interactive)
-  (let ((face 'default))
-    (set-face-attribute face t
-                        :family ns-input-font
-                        :height (* 10 ns-input-fontsize))
-    (set-face-attribute face (selected-frame)
-                        :family ns-input-font
-                        :height (* 10 ns-input-fontsize))
-    (let ((spec (list (list t (face-attr-construct 'default)))))
-      (put face 'customized-face spec)
-      (custom-push-theme 'theme-face face 'user 'set spec)
-      (put face 'face-modified nil))))
-
 ;; Default fontset for macOS.  This is mainly here to show how a fontset
 ;; can be set up manually.  Ordinarily, fontsets are auto-created whenever
 ;; a font is chosen by

src/nsfns.m

@@ -1593,26 +1593,22 @@ Frames are listed from topmost (first) to bottommost (last).  */)
     }
 }
 
-DEFUN ("ns-popup-font-panel", Fns_popup_font_panel, Sns_popup_font_panel,
-       0, 1, "",
-       doc: /* Pop up the font panel.  */)
-     (Lisp_Object frame)
+DEFUN ("x-select-font", Fx_select_font, Sx_select_font, 0, 2, 0,
+       doc: /* Read a font using a Nextstep dialog.
+Return a string describing the selected font.
+
+FRAME is the frame on which to pop up the font chooser.  If omitted or
+nil, it defaults to the selected frame. */)
+  (Lisp_Object frame, Lisp_Object ignored)
 {
   struct frame *f = decode_window_system_frame (frame);
-  id fm = [NSFontManager sharedFontManager];
-  struct font *font = f->output_data.ns->font;
-  NSFont *nsfont;
-#ifdef NS_IMPL_GNUSTEP
-  nsfont = ((struct nsfont_info *)font)->nsfont;
-#endif
-#ifdef NS_IMPL_COCOA
-  nsfont = (NSFont *) macfont_get_nsctfont (font);
-#endif
-  [fm setSelectedFont: nsfont isMultiple: NO];
-  [fm orderFrontFontPanel: NSApp];
-  return Qnil;
-}
+  Lisp_Object font = [FRAME_NS_VIEW (f) showFontPanel];
 
+  if (NILP (font))
+    quit ();
+
+  return font;
+}
 
 DEFUN ("ns-popup-color-panel", Fns_popup_color_panel, Sns_popup_color_panel,
        0, 1, "",
@@ -3299,7 +3295,7 @@ - (Lisp_Object)lispString
   defsubr (&Sns_emacs_info_panel);
   defsubr (&Sns_list_services);
   defsubr (&Sns_perform_service);
-  defsubr (&Sns_popup_font_panel);
+  defsubr (&Sx_select_font);
   defsubr (&Sns_popup_color_panel);
 
   defsubr (&Sx_show_tip);

src/nsterm.h

@@ -442,23 +442,25 @@ typedef id instancetype;
 #else
 @interface EmacsView : NSView <NSTextInput>
 #endif
-   {
+{
 #ifdef NS_IMPL_COCOA
-   char *old_title;
-   BOOL maximizing_resize;
+  char *old_title;
+  BOOL maximizing_resize;
 #endif
-   BOOL windowClosing;
-   NSString *workingText;
-   BOOL processingCompose;
-   int fs_state, fs_before_fs, next_maximized;
-   int maximized_width, maximized_height;
-   EmacsWindow *nonfs_window;
-   BOOL fs_is_native;
+  BOOL font_panel_active;
+  NSFont *font_panel_result;
+  BOOL windowClosing;
+  NSString *workingText;
+  BOOL processingCompose;
+  int fs_state, fs_before_fs, next_maximized;
+  int maximized_width, maximized_height;
+  EmacsWindow *nonfs_window;
+  BOOL fs_is_native;
 @public
-   struct frame *emacsframe;
-   int scrollbarsNeedingUpdate;
-   NSRect ns_userRect;
-   }
+  struct frame *emacsframe;
+  int scrollbarsNeedingUpdate;
+  NSRect ns_userRect;
+}
 
 /* AppKit-side interface */
 - (instancetype)menuDown: (id)sender;
@@ -485,6 +487,7 @@ typedef id instancetype;
 #ifdef NS_IMPL_GNUSTEP
 - (void)windowDidMove: (id)sender;
 #endif
+- (Lisp_Object) showFontPanel;
 - (int)fullscreenState;
 
 #if defined (NS_IMPL_COCOA) && MAC_OS_X_VERSION_MIN_REQUIRED >= 101400

src/nsterm.m

@@ -4442,10 +4442,10 @@ in certain situations (rapid incoming events).
 }
 
 
-int
-ns_select (int nfds, fd_set *readfds, fd_set *writefds,
-	   fd_set *exceptfds, struct timespec *timeout,
-	   sigset_t *sigmask)
+static int
+ns_select_1 (int nfds, fd_set *readfds, fd_set *writefds,
+	     fd_set *exceptfds, struct timespec *timeout,
+	     sigset_t *sigmask, BOOL run_loop_only)
 /* --------------------------------------------------------------------------
      Replacement for select, checking for events
    -------------------------------------------------------------------------- */
@@ -4461,7 +4461,7 @@ in certain situations (rapid incoming events).
   check_native_fs ();
 #endif
 
-  if (hold_event_q.nr > 0)
+  if (hold_event_q.nr > 0 && !run_loop_only)
     {
       /* We already have events pending.  */
       raise (SIGIO);
@@ -4479,12 +4479,12 @@ in certain situations (rapid incoming events).
   if (NSApp == nil
       || ![NSThread isMainThread]
       || (timeout && timeout->tv_sec == 0 && timeout->tv_nsec == 0))
-    return thread_select(pselect, nfds, readfds, writefds,
-                         exceptfds, timeout, sigmask);
+    return thread_select (pselect, nfds, readfds, writefds,
+			  exceptfds, timeout, sigmask);
   else
     {
       struct timespec t = {0, 0};
-      thread_select(pselect, 0, NULL, NULL, NULL, &t, sigmask);
+      thread_select (pselect, 0, NULL, NULL, NULL, &t, sigmask);
     }
 
   /* FIXME: This draining of outerpool causes a crash when a buffer
@@ -4602,6 +4602,15 @@ in certain situations (rapid incoming events).
   return result;
 }
 
+int
+ns_select (int nfds, fd_set *readfds, fd_set *writefds,
+	   fd_set *exceptfds, struct timespec *timeout,
+	   sigset_t *sigmask)
+{
+  return ns_select_1 (nfds, readfds, writefds, exceptfds,
+		      timeout, sigmask, NO);
+}
+
 #ifdef HAVE_PTHREAD
 void
 ns_run_loop_break (void)
@@ -6082,40 +6091,72 @@ - (void)dealloc
 
 
 /* Called on font panel selection.  */
-- (void)changeFont: (id)sender
+- (void) changeFont: (id) sender
 {
-  struct face *face = FACE_FROM_ID (emacsframe, DEFAULT_FACE_ID);
-  struct font *font = face->font;
-  id newFont;
-  CGFloat size;
+  struct font *font = FRAME_OUTPUT_DATA (emacsframe)->font;
   NSFont *nsfont;
-  struct input_event ie;
-
-  NSTRACE ("[EmacsView changeFont:]");
-  EVENT_INIT (ie);
 
 #ifdef NS_IMPL_GNUSTEP
-  nsfont = ((struct nsfont_info *)font)->nsfont;
-#endif
-#ifdef NS_IMPL_COCOA
+  nsfont = ((struct nsfont_info *) font)->nsfont;
+#else
   nsfont = (NSFont *) macfont_get_nsctfont (font);
 #endif
 
-  if ((newFont = [sender convertFont: nsfont]))
-    {
-      ie.kind = NS_NONKEY_EVENT;
-      ie.modifiers = 0;
-      ie.code = KEY_NS_CHANGE_FONT;
-      XSETFRAME (ie.frame_or_window, emacsframe);
+  if (!font_panel_active)
+    return;
 
-      size = [newFont pointSize];
-      ns_input_fontsize = make_fixnum (lrint (size));
-      ns_input_font = [[newFont familyName] lispString];
+  if (font_panel_result)
+    [font_panel_result release];
 
-      kbd_buffer_store_event (&ie);
-    }
+  font_panel_result = (NSFont *) [sender convertFont: nsfont];
+
+  if (font_panel_result)
+    [font_panel_result retain];
+
+  font_panel_active = NO;
+  [NSApp stop: self];
 }
 
+- (Lisp_Object) showFontPanel
+{
+  id fm = [NSFontManager sharedFontManager];
+  struct font *font = FRAME_OUTPUT_DATA (emacsframe)->font;
+  NSFont *nsfont, *result;
+  struct timespec timeout;
+
+#ifdef NS_IMPL_GNUSTEP
+  nsfont = ((struct nsfont_info *) font)->nsfont;
+#else
+  nsfont = (NSFont *) macfont_get_nsctfont (font);
+#endif
+
+  [fm setSelectedFont: nsfont isMultiple: NO];
+  [fm orderFrontFontPanel: NSApp];
+
+  font_panel_active = YES;
+  timeout = make_timespec (0, 100000000);
+
+  block_input ();
+  while (font_panel_active
+	 && [[fm fontPanel: YES] isVisible])
+    ns_select_1 (0, NULL, NULL, NULL, &timeout, NULL, YES);
+  unblock_input ();
+
+  if (font_panel_result)
+    [font_panel_result autorelease];
+
+  result = font_panel_result;
+  font_panel_result = nil;
+
+  [[fm fontPanel: YES] setIsVisible: NO];
+  font_panel_active = NO;
+
+  /* TODO: return a font spec instead of a string.  */
+  if (result)
+    return [[result familyName] lispString];
+
+  return Qnil;
+}
 
 - (BOOL)acceptsFirstResponder
 {
@@ -6123,7 +6164,6 @@ - (BOOL)acceptsFirstResponder
   return YES;
 }
 
-
 - (void)resetCursorRects
 {
   NSRect visible = [self visibleRect];