Don't disable borders for xwayland floating views

include/sway/tree/view.h

@@ -35,6 +35,7 @@ struct sway_view_impl {
 	void (*set_tiled)(struct sway_view *view, bool tiled);
 	void (*set_fullscreen)(struct sway_view *view, bool fullscreen);
 	bool (*wants_floating)(struct sway_view *view);
+	bool (*has_client_side_decorations)(struct sway_view *view);
 	void (*for_each_surface)(struct sway_view *view,
 		wlr_surface_iterator_func_t iterator, void *user_data);
 	void (*close)(struct sway_view *view);

sway/desktop/xwayland.c

@@ -246,6 +246,14 @@ static bool wants_floating(struct sway_view *view) {
 	return false;
 }
 
+static bool has_client_side_decorations(struct sway_view *view) {
+	if (xwayland_view_from_view(view) == NULL) {
+		return false;
+	}
+	struct wlr_xwayland_surface *surface = view->wlr_xwayland_surface;
+	return surface->decorations != WLR_XWAYLAND_SURFACE_DECORATIONS_ALL;
+}
+
 static void _close(struct sway_view *view) {
 	if (xwayland_view_from_view(view) == NULL) {
 		return;
@@ -269,6 +277,7 @@ static const struct sway_view_impl view_impl = {
 	.set_tiled = set_tiled,
 	.set_fullscreen = set_fullscreen,
 	.wants_floating = wants_floating,
+	.has_client_side_decorations = has_client_side_decorations,
 	.close = _close,
 	.destroy = destroy,
 };

sway/tree/view.c

@@ -315,7 +315,11 @@ void view_set_activated(struct sway_view *view, bool activated) {
 }
 
 void view_set_tiled(struct sway_view *view, bool tiled) {
-	view->border = tiled ? config->border : B_NONE;
+	bool csd = true;
+	if (view->impl->has_client_side_decorations) {
+		csd = view->impl->has_client_side_decorations(view);
+	}
+	view->border = tiled || !csd ? config->border : B_NONE;
 	if (view->impl->set_tiled) {
 		view->impl->set_tiled(view, tiled);
 	}