Fix issue when moving window between retina/non-retina screens while …

…window is under progressive redraw.

The problem was visible with test/mandelbrot and with layer-backed views.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@13100 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

src/Fl_cocoa.mm

@@ -1251,13 +1251,15 @@ - (void)windowDidMove:(NSNotification *)notif
   if (fl_mac_os_version < 101000) [nsw recursivelySendToSubwindows:@selector(setSubwindowFrame)];
   [nsw checkSubwindowFrame];
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_8
-  if (views_use_CA && [(FLView*)[nsw contentView] did_view_resolution_change]) {
+  FLView *view = (FLView*)[nsw contentView];
+  if (views_use_CA && [view did_view_resolution_change]) {
     if (!window->as_gl_window()) { // move layered non-GL window to different resolution
-     [(FLView*)[nsw contentView] viewFrameDidChange];
+      [view viewFrameDidChange];
+      [view displayLayer:[view layer]]; // useful for Mandelbrot to recreate the layer's bitmap
     }
     if (fl_mac_os_version < 101401 && window->parent() && window->as_gl_window() && Fl::use_high_res_GL()) {
       Fl_Cocoa_Window_Driver *d = Fl_Cocoa_Window_Driver::driver(window);
-      [[nsw contentView] layer].contentsScale = d->mapped_to_retina() ? 2. : 1.;
+      [view layer].contentsScale = d->mapped_to_retina() ? 2. : 1.;
     }
   }
 #endif
@@ -1289,7 +1291,9 @@ - (void)windowDidResize:(NSNotification *)notif
   [nsw recursivelySendToSubwindows:@selector(setSubwindowFrame)];
   [nsw recursivelySendToSubwindows:@selector(checkSubwindowFrame)];
   if (window->as_gl_window() && Fl_X::i(window)) d->in_windowDidResize(false);
-  if ([[nsw contentView] layer]) [(FLView*)[nsw contentView] viewFrameDidChange];
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_8
+  if (views_use_CA && [[nsw contentView] layer]) [(FLView*)[nsw contentView] viewFrameDidChange];
+#endif
   fl_unlock_function();
 }
 - (void)windowDidResignKey:(NSNotification *)notif