Replace hacky L_FLOATING container with a list

Workspaces previously had a magical `workspace->floating` container,
which had a layout of L_FLOATING and whose children were actual floating
views. This allowed some conveniences, but was a hacky solution because
the container has to be exempt from focus, coordinate transactions with
the workspace, and omit emitting IPC events (which we didn't do).

This commit changes it to be a list directly in the sway_workspace. The
L_FLOATING layout is no longer used so this has been removed as well.

* Fixes incorrect check in the swap command (it checked if the
containers had the L_FLOATING layout, but this layout applied to the
magical container).
* Introduces workspace_add_floating

1 files changed, 20 insertions, 34 deletions

diff --git a/sway/tree/container.c b/sway/tree/container.c
index 2a428ca5..ea20991c 100644
--- a/sway/tree/container.c
+++ b/sway/tree/container.c
@@ -67,7 +67,11 @@ void container_update_textures_recursive(struct sway_container *con) {
 		}
 
 		if (con->type == C_WORKSPACE) {
-			container_update_textures_recursive(con->sway_workspace->floating);
+			for (int i = 0; i < con->sway_workspace->floating->length; ++i) {
+				struct sway_container *floater =
+					con->sway_workspace->floating->items[i];
+				container_update_textures_recursive(floater);
+			}
 		}
 	}
 }
@@ -131,6 +135,7 @@ struct sway_container *container_create(enum sway_container_type type) {
 static void container_workspace_free(struct sway_workspace *ws) {
 	list_foreach(ws->output_priority, free);
 	list_free(ws->output_priority);
+	list_free(ws->floating);
 	free(ws);
 }
 
@@ -222,15 +227,14 @@ static struct sway_container *container_workspace_destroy(
 		for (int i = 0; i < workspace->children->length; i++) {
 			container_move_to(workspace->children->items[i], new_workspace);
 		}
-		struct sway_container *floating = workspace->sway_workspace->floating;
-		for (int i = 0; i < floating->children->length; i++) {
-			container_move_to(floating->children->items[i],
-					new_workspace->sway_workspace->floating);
+		list_t *floating = workspace->sway_workspace->floating;
+		for (int i = 0; i < floating->length; i++) {
+			struct sway_container *floater = floating->items[i];
+			container_remove_child(floater);
+			workspace_add_floating(new_workspace, floater);
 		}
 	}
 
-	container_destroy_noreaping(workspace->sway_workspace->floating);
-
 	return output;
 }
 
@@ -339,10 +343,6 @@ static struct sway_container *container_destroy_noreaping(
 }
 
 bool container_reap_empty(struct sway_container *con) {
-	if (con->layout == L_FLOATING) {
-		// Don't reap the magical floating container that each workspace has
-		return false;
-	}
 	switch (con->type) {
 	case C_ROOT:
 	case C_OUTPUT:
@@ -626,9 +626,8 @@ static struct sway_container *floating_container_at(double lx, double ly,
 			}
 			// Items at the end of the list are on top, so iterate the list in
 			// reverse.
-			for (int k = ws->floating->children->length - 1; k >= 0; --k) {
-				struct sway_container *floater =
-					ws->floating->children->items[k];
+			for (int k = ws->floating->length - 1; k >= 0; --k) {
+				struct sway_container *floater = ws->floating->items[k];
 				struct wlr_box box = {
 					.x = floater->x,
 					.y = floater->y,
@@ -664,9 +663,6 @@ struct sway_container *tiling_container_at(
 		return container_at_tabbed(con, lx, ly, surface, sx, sy);
 	case L_STACKED:
 		return container_at_stacked(con, lx, ly, surface, sx, sy);
-	case L_FLOATING:
-		sway_assert(false, "Didn't expect to see floating here");
-		return NULL;
 	case L_NONE:
 		return NULL;
 	}
@@ -880,9 +876,6 @@ static size_t get_tree_representation(struct sway_container *parent, char *buffe
 	case L_STACKED:
 		lenient_strcat(buffer, "S[");
 		break;
-	case L_FLOATING:
-		lenient_strcat(buffer, "F[");
-		break;
 	case L_NONE:
 		lenient_strcat(buffer, "D[");
 		break;
@@ -1012,7 +1005,7 @@ void container_set_floating(struct sway_container *container, bool enable) {
 
 	if (enable) {
 		struct sway_container *old_parent = container_remove_child(container);
-		container_add_child(workspace->sway_workspace->floating, container);
+		workspace_add_floating(workspace, container);
 		container_init_floating(container);
 		if (container->type == C_VIEW) {
 			view_set_tiled(container->sway_view, false);
@@ -1069,11 +1062,8 @@ void container_set_geometry_from_floating_view(struct sway_container *con) {
 }
 
 bool container_is_floating(struct sway_container *container) {
-	struct sway_container *workspace = container_parent(container, C_WORKSPACE);
-	if (!workspace) {
-		return false;
-	}
-	return container->parent == workspace->sway_workspace->floating;
+	return container->parent && container->parent->type == C_WORKSPACE &&
+		list_find(container->parent->sway_workspace->floating, container) != -1;
 }
 
 void container_get_box(struct sway_container *container, struct wlr_box *box) {
@@ -1153,7 +1143,7 @@ void container_floating_move_to(struct sway_container *con,
 		output_get_active_workspace(new_output->sway_output);
 	if (old_workspace != new_workspace) {
 		container_remove_child(con);
-		container_add_child(new_workspace->sway_workspace->floating, con);
+		workspace_add_floating(new_workspace, con);
 		arrange_windows(old_workspace);
 		arrange_windows(new_workspace);
 		workspace_detect_urgent(old_workspace);
@@ -1266,14 +1256,10 @@ void container_set_fullscreen(struct sway_container *container, bool enable) {
 }
 
 bool container_is_floating_or_child(struct sway_container *container) {
-	do {
-		if (container->parent && container->parent->layout == L_FLOATING) {
-			return true;
-		}
+	while (container->parent && container->parent->type != C_WORKSPACE) {
 		container = container->parent;
-	} while (container && container->type != C_WORKSPACE);
-
-	return false;
+	}
+	return container_is_floating(container);
 }
 
 bool container_is_fullscreen_or_child(struct sway_container *container) {