create/destroy decorations when fullscreen events are triggered exter…

…nally

components/pango_windowing/src/display_wayland.cpp

@@ -278,6 +278,10 @@ struct Decoration {
         buttons.clear();
     }
 
+    bool visible() {
+        return !(decorations.empty() && buttons.empty());
+    }
+
     void resize(const int32_t width, const int32_t height) {
         for(const DecorationSurface &d : decorations) { d.resize(width, height); }
         for(const ButtonSurface &b : buttons) { b.reposition(width); }
@@ -518,11 +522,17 @@ static void handle_configure_toplevel(void *data, struct xdg_toplevel */*xdg_top
 
     if(!w->is_fullscreen && (width!=0 && height!=0)) {
         // has decoration
+        if (!w->decoration->visible()) {
+            w->decoration->create();
+        }
         w->decoration->toContentSize(restore_w, restore_h, w->width, w->height);
         w->width = std::max(w->width, int(min_width));
         w->height = std::max(w->height, int(min_height));
     }
     else {
+        if (w->decoration->visible()) {
+            w->decoration->destroy();
+        }
         w->width = restore_w;
         w->height = restore_h;
     }