macos: use input_region to specify tracking areas

We want our tracking area to be limited to the input region so that we
don't pass along events outside of them for the window. This improves the
chances we click-out of a popover with a large shadow.

This still doesn't let us pass-through clicks for large shadows on top-
level windows though.

gdk/macos/GdkMacosBaseView.c

@@ -45,7 +45,6 @@
 
       options = (NSTrackingMouseEnteredAndExited |
                  NSTrackingMouseMoved |
-                 NSTrackingInVisibleRect |
                  NSTrackingActiveAlways);
       trackingArea = [[NSTrackingArea alloc] initWithRect:rect
                                                   options:options
@@ -57,9 +56,26 @@
   return self;
 }
 
+-(void)setInputArea:(const cairo_rectangle_int_t *)area
+{
+  NSRect rect = NSMakeRect (area->x, area->y, area->width, area->height);
+  NSTrackingAreaOptions options;
+
+  [self removeTrackingArea:trackingArea];
+
+  options = (NSTrackingMouseEnteredAndExited |
+             NSTrackingMouseMoved |
+             NSTrackingActiveAlways);
+  trackingArea = [[NSTrackingArea alloc] initWithRect:rect
+                                              options:options
+                                                owner:(id)self
+                                             userInfo:nil];
+  [self addTrackingArea:trackingArea];
+}
+
 -(void)setOpaqueRegion:(cairo_region_t *)region
 {
-  /* Do nothing */
+  /* Handled in Subclass */
 }
 
 -(BOOL)acceptsFirstMouse

gdk/macos/GdkMacosBaseView.h

@@ -42,5 +42,6 @@
 -(void)setNeedsInvalidateShadow: (BOOL)invalidate;
 -(NSTrackingArea *)trackingArea;
 -(void)setOpaqueRegion:(cairo_region_t *)region;
+-(void)setInputArea:(const cairo_rectangle_int_t *)area;
 
 @end

gdk/macos/gdkmacossurface.c

@@ -94,6 +94,17 @@ static void
 gdk_macos_surface_set_input_region (GdkSurface     *surface,
                                     cairo_region_t *region)
 {
+  GdkMacosSurface *self = (GdkMacosSurface *)surface;
+  cairo_rectangle_int_t rect;
+
+  g_assert (GDK_IS_MACOS_SURFACE (self));
+
+  if (self->window == NULL)
+    return;
+
+  cairo_region_get_extents (region, &rect);
+
+  [(GdkMacosBaseView *)[self->window contentView] setInputArea:&rect];
 }
 
 static void