[gimp/gimp-2-10] Fix plugin focus issues on osx GTK/OSX does not automatically assign focus to the new windows (upstr

[Michael Natterer <mitch src gnome org>]

commit 3adf4a4861ba0641e64caaf6fd80a794da7687a9
Author: Oleksii Samorukov <samm os2 kiev ua>
Date:   Thu Oct 18 09:26:05 2018 +0200

    Fix plugin focus issues on osx
    GTK/OSX does not automatically assign focus to the new windows (upstream
    issue), so activateIgnoringOtherApps is called. However, if it is called
    before gtk initialized it may cause number of focus issues.

 libgimp/gimpui.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/libgimp/gimpui.c b/libgimp/gimpui.c
index 54e04ee357..11bccd2e01 100644
--- a/libgimp/gimpui.c
+++ b/libgimp/gimpui.c
@@ -80,7 +80,9 @@ static void      gimp_ui_draw_pixbuf_layout     (GtkStyle      *style,
                                                  gint           x,
                                                  gint           y,
                                                  PangoLayout   *layout);
-
+#ifdef GDK_WINDOWING_QUARTZ
+static void      gimp_osx_focus_window           (void);
+#endif
 
 static gboolean gimp_ui_initialized = FALSE;
 
@@ -182,7 +184,7 @@ gimp_ui_init (const gchar *prog_name,
   gimp_dialogs_show_help_button (gimp_show_help_button ());
 
 #ifdef GDK_WINDOWING_QUARTZ
-  [NSApp activateIgnoringOtherApps:YES];
+  g_idle_add ((GSourceFunc) gimp_osx_focus_window, NULL);
 #endif
 
   gimp_ui_fix_pixbuf_style ();
@@ -492,3 +494,11 @@ gimp_ui_draw_pixbuf_layout (GtkStyle      *style,
   if (area)
     gdk_gc_set_clip_rectangle (gc, NULL);
 }
+
+#ifdef GDK_WINDOWING_QUARTZ
+static void
+gimp_osx_focus_window (void)
+{
+  [NSApp activateIgnoringOtherApps:YES];
+}
+#endif