add --smart-titles flag to hide_edge_borders

to hide the title bar on workspaces with one child, fix swaywm#7409

include/sway/config.h

@@ -556,6 +556,7 @@ struct sway_config {
 	enum edge_border_types hide_edge_borders;
 	enum edge_border_smart_types hide_edge_borders_smart;
 	bool hide_lone_tab;
+	bool hide_lone_title;
 
 	// border colors
 	struct {

sway/commands/hide_edge_borders.c

@@ -13,7 +13,13 @@ struct cmd_results *cmd_hide_edge_borders(int argc, char **argv) {
 	}
 
 	bool hide_lone_tab = false;
-	if (strcmp(*argv, "--i3") == 0) {
+	bool hide_lone_title = false;
+	if (strcmp(*argv, "--smart-titles") == 0) {
+		hide_lone_tab = true;
+		hide_lone_title = true;
+		++argv;
+		--argc;
+	} else if (strcmp(*argv, "--i3") == 0) {
 		hide_lone_tab = true;
 		++argv;
 		--argc;
@@ -41,6 +47,7 @@ struct cmd_results *cmd_hide_edge_borders(int argc, char **argv) {
 		return cmd_results_new(CMD_INVALID, "%s", expected_syntax);
 	}
 	config->hide_lone_tab = hide_lone_tab;
+	config->hide_lone_title = hide_lone_title;
 
 	arrange_root();
 

sway/config.c

@@ -306,6 +306,7 @@ static void config_defaults(struct sway_config *config) {
 	config->hide_edge_borders = E_NONE;
 	config->hide_edge_borders_smart = ESMART_OFF;
 	config->hide_lone_tab = false;
+	config->hide_lone_title = false;
 
 	config->has_focused_tab_title = false;
 

sway/sway.5.scd

@@ -741,10 +741,11 @@ The default colors are:
 	This affects new workspaces only, and is used when the workspace doesn't
 	have its own gaps settings (see: workspace <ws> gaps ...).
 
-*hide_edge_borders* [--i3] none|vertical|horizontal|both|smart|smart_no_gaps
+*hide_edge_borders* [--i3 | --smart-titles] none|vertical|horizontal|both|smart|smart_no_gaps
 	Hides window borders adjacent to the screen edges. Default is _none_. The
 	_--i3_ option enables i3-compatible behavior to hide the title bar on
-	tabbed and stacked containers with one child. The _smart_|_smart_no_gaps_
+	tabbed and stacked containers with one child. The --smart-titles option
+	hide the title bar on workspaces with only one child. The _smart_|_smart_no_gaps_
 	options are equivalent to setting _smart_borders_ smart|no_gaps and
 	_hide_edge_borders_ none.
 

sway/tree/view.c

@@ -356,8 +356,14 @@ void view_autoconfigure(struct sway_view *view) {
 			height = con->pending.height - y_offset
 				- con->pending.border_thickness * con->pending.border_bottom;
 		} else {
-			y = con->pending.y + container_titlebar_height();
-			height = con->pending.height - container_titlebar_height()
+			int titlebar_height;
+			if (config->hide_lone_title && view_is_only_visible(view)) {
+				titlebar_height = con->pending.border_thickness * con->pending.border_top + y_offset;
+			} else {
+				titlebar_height = container_titlebar_height();
+			}
+			y = con->pending.y + titlebar_height;
+			height = con->pending.height - titlebar_height
 				- con->pending.border_thickness * con->pending.border_bottom;
 		}
 		break;