Enable backgrounds and panels to be shell surfaces

Prior to this commit all windows (e.g. shell surfaces) were handled the same
way in handle_view_created. Since backgrounds and panels have to be treated
differently, they could not be shell surfaces. This changes checks whether
a client is a background or a panel in handle_view_created and exists to
let them be dealt with elsewhere.

include/extensions.h

@@ -11,6 +11,8 @@ struct background_config {
         wlc_resource surface;
         // we need the wl_resource of the surface in the destructor
         struct wl_resource *wl_surface_res;
+        // used to determine if client is a background
+	struct wl_client *client;
 };
 
 struct panel_config {
@@ -21,6 +23,8 @@ struct panel_config {
         // we need the wl_resource of the surface in the destructor
         struct wl_resource *wl_surface_res;
         enum desktop_shell_panel_position panel_position;
+        // used to determine if client is a panel
+	struct wl_client *client;
 };
 
 struct desktop_shell_state {

sway/extensions.c

@@ -73,6 +73,7 @@ static void set_background(struct wl_client *client, struct wl_resource *resourc
 	}
 	sway_log(L_DEBUG, "Setting surface %p as background for output %d", surface, (int)output);
 	struct background_config *config = malloc(sizeof(struct background_config));
+	config->client = client;
 	config->output = output;
 	config->surface = wlc_resource_from_wl_surface_resource(surface);
 	config->wl_surface_res = surface;
@@ -91,6 +92,7 @@ static void set_panel(struct wl_client *client, struct wl_resource *resource,
 	sway_log(L_DEBUG, "Setting surface %p as panel for output %d (wl_resource: %p)", surface, (int)output, resource);
 	struct panel_config *config = find_or_create_panel_config(resource);
 	config->output = output;
+	config->client = client;
 	config->surface = wlc_resource_from_wl_surface_resource(surface);
 	config->wl_surface_res = surface;
 	wl_resource_set_destructor(surface, panel_surface_destructor);

sway/handlers.c

@@ -176,6 +176,28 @@ static void handle_output_focused(wlc_handle output, bool focus) {
 	}
 }
 
+static bool client_is_background(struct wl_client *client) {
+	int i;
+	for (i = 0; i < desktop_shell.backgrounds->length; i++) {
+		struct background_config *config = desktop_shell.backgrounds->items[i];
+		if (config->client == client) {
+			return true;
+		}
+	}
+	return false;
+}
+
+static bool client_is_panel(struct wl_client *client) {
+	int i;
+	for (i = 0; i < desktop_shell.panels->length; i++) {
+		struct panel_config *config = desktop_shell.panels->items[i];
+		if (config->client == client) {
+			return true;
+		}
+	}
+	return false;
+}
+
 static bool handle_view_created(wlc_handle handle) {
 	// if view is child of another view, the use that as focused container
 	wlc_handle parent = wlc_view_get_parent(handle);
@@ -186,6 +208,10 @@ static bool handle_view_created(wlc_handle handle) {
 	struct wl_client *client = wlc_view_get_wl_client(handle);
 	pid_t pid;
 
+	if (client_is_background(client) || client_is_panel(client)) {
+		return true;
+	}
+
 	// Get parent container, to add view in
 	if (parent) {
 		focused = swayc_by_handle(parent);