Implement popup_during_fullscreen

This introduces a new view_impl function: is_transient_for. Similar to
container_has_ancestor but works using the surface parents rather than
the tree.

This patch modifies view_is_visible, container_at and so on to allow
transient views to function normally when they're in front of a
fullscreen view.

1 files changed, 4 insertions, 0 deletions

diff --git a/include/sway/tree/view.h b/include/sway/tree/view.h
index 028be536..eb1e98e1 100644
--- a/include/sway/tree/view.h
+++ b/include/sway/tree/view.h
@@ -49,6 +49,8 @@ struct sway_view_impl {
                 wlr_surface_iterator_func_t iterator, void *user_data);
         void (*for_each_popup)(struct sway_view *view,
                 wlr_surface_iterator_func_t iterator, void *user_data);
+        bool (*is_transient_for)(struct sway_view *child,
+                        struct sway_view *ancestor);
         void (*close)(struct sway_view *view);
         void (*close_popups)(struct sway_view *view);
         void (*destroy)(struct sway_view *view);
@@ -396,4 +398,6 @@ void view_remove_saved_buffer(struct sway_view *view);
 
 void view_save_buffer(struct sway_view *view);
 
+bool view_is_transient_for(struct sway_view *child, struct sway_view *ancestor);
+
 #endif