Fix smart gaps

include/sway/tree/view.h

@@ -255,6 +255,13 @@ void view_get_constraints(struct sway_view *view, double *min_width,
 uint32_t view_configure(struct sway_view *view, double lx, double ly, int width,
 	int height);
 
+/**
+ * Whether or not the view is the only visible view in its tree. If the view
+ * is tiling, there may be floating views. If the view is floating, there may
+ * be tiling views or views in a different floating container.
+ */
+bool view_is_only_visible(struct sway_view *view);
+
 /**
  * Configure the view's position and size based on the container's position and
  * size, taking borders into consideration.

sway/input/seat.c

@@ -760,6 +760,12 @@ void seat_set_focus_warp(struct sway_seat *seat, struct sway_node *node,
 
 	seat->has_focus = true;
 
+	if (config->smart_gaps) {
+		// When smart gaps is on, gaps may change when the focus changes so
+		// the workspace needs to be arranged
+		arrange_workspace(new_workspace);
+	}
+
 	update_debug_tree();
 }
 

sway/tree/container.c

@@ -1021,10 +1021,28 @@ void container_add_gaps(struct sway_container *c) {
 	if (!c->view && c->layout != L_TABBED && c->layout != L_STACKED) {
 		return;
 	}
-	// Children of tabbed/stacked containers re-use the gaps of the container
-	enum sway_container_layout layout = container_parent_layout(c);
-	if (layout == L_TABBED || layout == L_STACKED) {
-		return;
+	// Descendants of tabbed/stacked containers re-use the gaps of the container
+	struct sway_container *temp = c;
+	while (temp) {
+		enum sway_container_layout layout = container_parent_layout(temp);
+		if (layout == L_TABBED || layout == L_STACKED) {
+			return;
+		}
+		temp = temp->parent;
+	}
+	// If smart gaps is on, don't add gaps if there is only one view visible
+	if (config->smart_gaps) {
+		struct sway_view *view = c->view;
+		if (!view) {
+			struct sway_seat *seat =
+				input_manager_get_default_seat(input_manager);
+			struct sway_container *focus =
+				seat_get_focus_inactive_view(seat, &c->node);
+			view = focus ? focus->view : NULL;
+		}
+		if (view && view_is_only_visible(view)) {
+			return;
+		}
 	}
 
 	struct sway_workspace *ws = c->workspace;

sway/tree/view.c

@@ -162,6 +162,23 @@ uint32_t view_configure(struct sway_view *view, double lx, double ly, int width,
 	return 0;
 }
 
+bool view_is_only_visible(struct sway_view *view) {
+	bool only_view = true;
+	struct sway_container *con = view->container;
+	while (con) {
+		enum sway_container_layout layout = container_parent_layout(con);
+		if (layout != L_TABBED && layout != L_STACKED) {
+			list_t *siblings = container_get_siblings(con);
+			if (siblings && siblings->length > 1) {
+				only_view = false;
+				break;
+			}
+		}
+		con = con->parent;
+	}
+	return only_view;
+}
+
 void view_autoconfigure(struct sway_view *view) {
 	if (!view->container->workspace) {
 		// Hidden in the scratchpad
@@ -178,24 +195,9 @@ void view_autoconfigure(struct sway_view *view) {
 	}
 
 	struct sway_workspace *ws = view->container->workspace;
-
-	bool other_views = false;
-	if (config->hide_edge_borders == E_SMART) {
-		struct sway_container *con = view->container;
-		while (con) {
-			enum sway_container_layout layout = container_parent_layout(con);
-			if (layout != L_TABBED && layout != L_STACKED) {
-				list_t *siblings = container_get_siblings(con);
-				if (siblings && siblings->length > 1) {
-					other_views = true;
-					break;
-				}
-			}
-			con = con->parent;
-		}
-	}
-
 	struct sway_container *con = view->container;
+	bool other_views = config->hide_edge_borders == E_SMART ?
+		!view_is_only_visible(view) : false;
 
 	view->border_top = view->border_bottom = true;
 	view->border_left = view->border_right = true;

sway/tree/workspace.c

@@ -640,11 +640,17 @@ void workspace_add_gaps(struct sway_workspace *ws) {
 	if (ws->current_gaps > 0) {
 		return;
 	}
-	bool should_apply =
-		config->edge_gaps || (config->smart_gaps && ws->tiling->length > 1);
-	if (!should_apply) {
+	if (!config->edge_gaps) {
 		return;
 	}
+	if (config->smart_gaps) {
+		struct sway_seat *seat = input_manager_get_default_seat(input_manager);
+		struct sway_container *focus =
+			seat_get_focus_inactive_view(seat, &ws->node);
+		if (focus && focus->view && view_is_only_visible(focus->view)) {
+			return;
+		}
+	}
 
 	ws->current_gaps = ws->gaps_outer;