server: Also crop the update region of children when moving a window.
diff --git a/server/window.c b/server/window.c
index 4c3b3ba..3a67b8d 100644
--- a/server/window.c
+++ b/server/window.c
@@ -1097,6 +1097,45 @@
}
+/* crop the update region of children to the specified rectangle, in client coords */
+static void crop_children_update_region( struct window *win, rectangle_t *rect )
+{
+ struct window *child;
+ struct region *tmp = create_empty_region();
+ rectangle_t child_rect;
+
+ LIST_FOR_EACH_ENTRY( child, &win->children, struct window, entry )
+ {
+ if (!(child->style & WS_VISIBLE)) continue;
+ if (!rect) /* crop everything out */
+ {
+ crop_children_update_region( child, NULL );
+ set_update_region( child, NULL );
+ continue;
+ }
+
+ /* nothing to do if child is completely inside rect */
+ if (child->window_rect.left >= rect->left &&
+ child->window_rect.top >= rect->top &&
+ child->window_rect.right <= rect->right &&
+ child->window_rect.bottom <= rect->bottom) continue;
+
+ /* map to child client coords and crop grand-children */
+ child_rect = *rect;
+ offset_rect( &child_rect, -child->client_rect.left, -child->client_rect.top );
+ crop_children_update_region( child, &child_rect );
+
+ /* now crop the child itself */
+ if (!child->update_region) continue;
+ if (!(tmp = create_empty_region())) continue;
+ set_region_rect( tmp, rect );
+ offset_region( tmp, -child->window_rect.left, -child->window_rect.top );
+ if (intersect_region( tmp, child->update_region, tmp )) set_update_region( child, tmp );
+ else free_region( tmp );
+ }
+}
+
+
/* validate the non client area of a window */
static void validate_non_client( struct window *win )
{
@@ -1521,6 +1560,17 @@
else set_update_region( win, NULL ); /* visible rect is empty */
}
+ /* crop children regions to the new window rect */
+
+ if (get_window_visible_rect( win, &rect, 0 ))
+ {
+ /* map to client coords */
+ offset_rect( &rect, win->window_rect.left - win->client_rect.left,
+ win->window_rect.top - win->client_rect.top );
+ crop_children_update_region( win, &rect );
+ }
+ else crop_children_update_region( win, NULL );
+
if (swp_flags & SWP_NOREDRAW) goto done; /* do not repaint anything */
/* expose the whole non-client area if it changed in any way */
