Fix longstanding focus bug with mouse (not sloppy) focus mode with popup

2006-10-01  Elijah Newren  <newren gmail com>

	Fix longstanding focus bug with mouse (not sloppy) focus mode with
	popup override-redirect windows, particularly mozilla and
	firefox's location bar autocompletion.  #357695.

	* src/display.c (event_callback -- EnterNotify & LeaveNotify events):
	for mouse focus, defocus the focused window when the mouse enters
	the desktop window rather than when the mouse leaves the focused
	window.

	* doc/how-to-get-focus-right.txt:
	update for the slightly nuanced definition of mouse focus (people
	without a DESKTOP window like nautilus get sloppy focus behavior
	now)

ChangeLog

@@ -1,3 +1,19 @@
+2006-10-01  Elijah Newren  <newren gmail com>
+
+	Fix longstanding focus bug with mouse (not sloppy) focus mode with
+	popup override-redirect windows, particularly mozilla and
+	firefox's location bar autocompletion.  #357695.
+
+	* src/display.c (event_callback -- EnterNotify & LeaveNotify events):
+	for mouse focus, defocus the focused window when the mouse enters
+	the desktop window rather than when the mouse leaves the focused
+	window.
+
+	* doc/how-to-get-focus-right.txt:
+	update for the slightly nuanced definition of mouse focus (people
+	without a DESKTOP window like nautilus get sloppy focus behavior
+	now)
+
 2006-09-27  Elijah Newren  <newren gmail com>
 
 	* src/menu.c (var menuitems): Patch from Bruno Boaventura to add

doc/how-to-get-focus-right.txt

@@ -9,7 +9,8 @@ basics are easy:
 Focus method  Behavior
     click     When a user clicks on a window, focus it
    sloppy     When an EnterNotify is received, focus the window
-    mouse     Same as sloppy, but also defocus on LeaveNotify
+    mouse     Same as sloppy, but also defocus when mouse enters DESKTOP
+              window
 
 Note that these choices (along with the choice that clicking on a
 window raises it for the click focus method) introduces the following
@@ -20,8 +21,9 @@ Focus method  Invariant
    sloppy     If the mouse is in a window, then it is focused; if the
               mouse is not in a window, then the most recently used
               window is focused.
-    mouse     If the mouse is in a window, then it is focused; otherwise,
+
-              the designated "no_focus_window" is focused
+    mouse     If the mouse is in a non-DESKTOP window, then it is focused;
+              otherwise, the designated "no_focus_window" is focused
 
 However, there are a number of cases where the current focus window
 becomes invalid and another should be chosen.  Some examples are when
@@ -34,8 +36,10 @@ Focus method  Behavior
               on top)
    sloppy     Focus the window containing the pointer if there is such
               a window, otherwise focus the most recently used window.
-    mouse     Focus the window containing the pointer if there is one,
+
-              otherwise focus the designated "no_focus_window".
+    mouse     Focus the non-DESKTOP window containing the pointer if
+              there is one, otherwise focus the designated
+              "no_focus_window".
 
 Note that "most recently used window", as used here, has a slightly
 different connotation than "most recent to have keyboard focus".  This
@@ -123,6 +127,7 @@ To read more about the bugs that inspired these choices:
   - Mousenav vs. Keynav in mouse and sloppy focus modes
     http://bugzilla.gnome.org/show_bug.cgi?id=167545
     http://bugzilla.gnome.org/show_bug.cgi?id=101190
+    http://bugzilla.gnome.org/show_bug.cgi?id=357695
   - Not focusing panels
     http://bugzilla.gnome.org/show_bug.cgi?id=160470
     http://bugzilla.gnome.org/show_bug.cgi?id=120100

src/display.c

@@ -1847,6 +1847,7 @@ event_callback (XEvent   *event,
             {
             case META_FOCUS_MODE_SLOPPY:
             case META_FOCUS_MODE_MOUSE:
+              display->mouse_mode = TRUE;
               if (window->type != META_WINDOW_DOCK &&
                   window->type != META_WINDOW_DESKTOP)
                 {
@@ -1858,7 +1859,6 @@ event_callback (XEvent   *event,
                               event->xany.serial,
                               event->xcrossing.time);
 
-                  display->mouse_mode = TRUE;
                   meta_window_focus (window, event->xcrossing.time);
 
                   /* stop ignoring stuff */
@@ -1874,6 +1874,27 @@ event_callback (XEvent   *event,
                                   "Auto raise is disabled\n");		      
                     }
                 }
+              /* In mouse focus mode, we defocus when the mouse *enters*
+               * the DESKTOP window, instead of defocusing on LeaveNotify.
+               * This is because having the mouse enter override-redirect
+               * child windows unfortunately causes LeaveNotify events that
+               * we can't distinguish from the mouse actually leaving the
+               * toplevel window as we expect.  But, since we filter out
+               * EnterNotify events on override-redirect windows, this
+               * alternative mechanism works great.
+               */
+              if (window->type == META_WINDOW_DESKTOP &&
+                  meta_prefs_get_focus_mode() == META_FOCUS_MODE_MOUSE &&
+                  display->expected_focus_window != NULL)
+                {
+                  meta_topic (META_DEBUG_FOCUS,
+                              "Unsetting focus from %s due to mouse entering "
+                              "the DESKTOP window\n",
+                              display->expected_focus_window->desc);
+                  meta_display_focus_the_no_focus_window (display, 
+                                                          window->screen,
+                                                          event->xcrossing.time);
+                }
               break;
             case META_FOCUS_MODE_CLICK:
               break;
@@ -1890,40 +1911,6 @@ event_callback (XEvent   *event,
         meta_window_handle_mouse_grab_op_event (window, event);
       else if (window != NULL)
         {
-          switch (meta_prefs_get_focus_mode ())
-            {
-            case META_FOCUS_MODE_MOUSE:
-              if ((window->frame == NULL || frame_was_receiver) &&
-                  event->xcrossing.mode != NotifyGrab && 
-                  event->xcrossing.mode != NotifyUngrab &&
-                  event->xcrossing.detail != NotifyInferior &&
-                  meta_display_focus_sentinel_clear (display))
-                {
-                  if (window == display->expected_focus_window)
-                    {
-                      meta_topic (META_DEBUG_FOCUS,
-                                  "Unsetting focus from %s due to LeaveNotify\n",
-                                  window->desc);
-                      meta_display_focus_the_no_focus_window (display, 
-                                                              window->screen,
-                                                              event->xcrossing.time);
-                    }
-                  if (window->type != META_WINDOW_DOCK &&
-                      window->type != META_WINDOW_DESKTOP)
-                    {
-                      meta_topic (META_DEBUG_FOCUS,
-                                  "Setting display->mouse_mode to TRUE due to "
-                                  "LeaveNotify at time %lu.\n",
-                                  event->xcrossing.time);
-                      display->mouse_mode = TRUE;
-                    }
-                }
-              break;
-            case META_FOCUS_MODE_SLOPPY:
-            case META_FOCUS_MODE_CLICK:
-              break;
-            }
-          
           if (window->type == META_WINDOW_DOCK &&
               event->xcrossing.mode != NotifyGrab &&
               event->xcrossing.mode != NotifyUngrab &&