tree/container: introduce `container_is_sticky[_or_child]` functions

To query whether a container is sticky, checking `con->is_sticky` is
insufficient. `container_is_floating_or_child` must also return true;
this led to a lot of repetition.

This commit introduces `container_is_sticky[_or_child]` functions, and
switches all stickiness checks to use them. (Including ones where the
container is already known to be floating, for consistency.)

include/sway/tree/container.h

@@ -78,6 +78,9 @@ struct sway_container {
 	enum sway_container_layout layout;
 	enum sway_container_layout prev_split_layout;
 
+	// Whether stickiness has been enabled on this container. Use
+	// `container_is_sticky_[or_child]` rather than accessing this field
+	// directly; it'll also check that the container is floating.
 	bool is_sticky;
 
 	// For C_ROOT, this has no meaning
@@ -367,4 +370,8 @@ bool container_is_scratchpad_hidden(struct sway_container *con);
 
 bool container_is_scratchpad_hidden_or_child(struct sway_container *con);
 
+bool container_is_sticky(struct sway_container *con);
+
+bool container_is_sticky_or_child(struct sway_container *con);
+
 #endif

sway/commands/move.c

@@ -482,7 +482,7 @@ static struct cmd_results *cmd_move_container(bool no_auto_back_and_forth,
 			// We have to create the workspace, but if the container is
 			// sticky and the workspace is going to be created on the same
 			// output, we'll bail out first.
-			if (container->is_sticky && container_is_floating_or_child(container)) {
+			if (container_is_sticky_or_child(container)) {
 				struct sway_output *new_output =
 					workspace_get_initial_output(ws_name);
 				if (old_output == new_output) {
@@ -521,8 +521,8 @@ static struct cmd_results *cmd_move_container(bool no_auto_back_and_forth,
 		return cmd_move_to_scratchpad();
 	}
 
-	if (container->is_sticky && container_is_floating_or_child(container) &&
-			old_output && node_has_ancestor(destination, &old_output->node)) {
+	if (container_is_sticky_or_child(container) && old_output &&
+			node_has_ancestor(destination, &old_output->node)) {
 		return cmd_results_new(CMD_FAILURE, "Can't move sticky "
 				"container to another workspace on the same output");
 	}

sway/commands/sticky.c

@@ -25,7 +25,7 @@ struct cmd_results *cmd_sticky(int argc, char **argv) {
 
 	container->is_sticky = parse_boolean(argv[0], container->is_sticky);
 
-	if (container->is_sticky && container_is_floating_or_child(container) &&
+	if (container_is_sticky_or_child(container) &&
 			!container_is_scratchpad_hidden(container)) {
 		// move container to active workspace
 		struct sway_workspace *active_workspace =

sway/input/seat.c

@@ -1151,7 +1151,7 @@ void seat_set_focus(struct sway_seat *seat, struct sway_node *node) {
 		for (int i = 0; i < new_output_last_ws->floating->length; ++i) {
 			struct sway_container *floater =
 				new_output_last_ws->floating->items[i];
-			if (floater->is_sticky) {
+			if (container_is_sticky(floater)) {
 				container_detach(floater);
 				workspace_add_floating(new_workspace, floater);
 				--i;

sway/tree/container.c

@@ -1609,3 +1609,11 @@ bool container_is_scratchpad_hidden_or_child(struct sway_container *con) {
 	con = container_toplevel_ancestor(con);
 	return con->scratchpad && !con->workspace;
 }
+
+bool container_is_sticky(struct sway_container *con) {
+	return con->is_sticky && container_is_floating(con);
+}
+
+bool container_is_sticky_or_child(struct sway_container *con) {
+	return container_is_sticky(container_toplevel_ancestor(con));
+}

sway/tree/view.c

@@ -1244,13 +1244,9 @@ bool view_is_visible(struct sway_view *view) {
 			return false;
 		}
 	}
-	// Determine if view is nested inside a floating container which is sticky
-	struct sway_container *floater = view->container;
-	while (floater->parent) {
-		floater = floater->parent;
-	}
-	bool is_sticky = container_is_floating(floater) && floater->is_sticky;
-	if (!is_sticky && workspace && !workspace_is_visible(workspace)) {
+
+	if (!container_is_sticky_or_child(view->container) && workspace &&
+			!workspace_is_visible(workspace)) {
 		return false;
 	}
 	// Check view isn't in a tabbed or stacked container on an inactive tab

sway/tree/workspace.c

@@ -498,7 +498,7 @@ bool workspace_is_empty(struct sway_workspace *ws) {
 	// Sticky views are not considered to be part of this workspace
 	for (int i = 0; i < ws->floating->length; ++i) {
 		struct sway_container *floater = ws->floating->items[i];
-		if (!floater->is_sticky) {
+		if (!container_is_sticky(floater)) {
 			return false;
 		}
 	}
@@ -819,7 +819,7 @@ size_t workspace_num_tiling_views(struct sway_workspace *ws) {
 }
 
 static void count_sticky_containers(struct sway_container *con, void *data) {
-	if (container_is_floating(con) && con->is_sticky) {
+	if (container_is_sticky(con)) {
 		size_t *count = data;
 		*count += 1;
 	}