fix: titlebars on containers with smart_gaps on and a large corner_radius now render as expected

sway/commands/corner_radius.c

@@ -1,6 +1,7 @@
 #include <string.h>
 #include "sway/commands.h"
 #include "sway/config.h"
+#include "sway/tree/container.h"
 #include "log.h"
 
 struct cmd_results *cmd_corner_radius(int argc, char **argv) {
@@ -17,7 +18,16 @@ struct cmd_results *cmd_corner_radius(int argc, char **argv) {
 
 	config->corner_radius = value;
 
-	// TODO: rerender windows (see opacity cmd)
+	/*
+	 titlebar padding depends on corner_radius to
+	 ensure that titlebars are rendered nicely
+	*/
+	if (value > config->titlebar_h_padding) {
+		config->titlebar_h_padding = value;
+	}
+	if (value > (int)container_titlebar_height()) {
+		config->titlebar_v_padding = (value - config->font_height) / 2;
+	}
 
 	return cmd_results_new(CMD_SUCCESS, NULL);
 }

sway/commands/titlebar_padding.c

@@ -2,6 +2,7 @@
 #include "sway/commands.h"
 #include "sway/config.h"
 #include "sway/output.h"
+#include "sway/swaynag.h"
 #include "sway/tree/arrange.h"
 #include "log.h"
 
@@ -27,8 +28,28 @@ struct cmd_results *cmd_titlebar_padding(int argc, char **argv) {
 		}
 	}
 
-	config->titlebar_v_padding = v_value;
+	/*
-	config->titlebar_h_padding = h_value;
+	 titlebar padding depends on corner_radius to
+	 ensure that titlebars are rendered nicely
+	*/
+	if (v_value > (config->corner_radius - config->font_height) / 2) {
+		config->titlebar_v_padding = v_value;
+	} else {
+		config_add_swaynag_warning(
+			"titlebar_v_padding (%d) is too small for the current corner radius (%d)",
+			v_value, config->corner_radius
+		);
+		return cmd_results_new(CMD_FAILURE, NULL);
+	}
+	if (h_value > config->corner_radius) {
+		config->titlebar_h_padding = h_value;
+	} else {
+		config_add_swaynag_warning(
+			"titlebar_h_padding (%d) is too small for the current corner radius (%d)",
+			h_value, config->corner_radius
+		);
+		return cmd_results_new(CMD_FAILURE, NULL);
+	}
 
 	for (int i = 0; i < root->outputs->length; ++i) {
 		struct sway_output *output = root->outputs->items[i];

sway/desktop/render.c

@@ -563,14 +563,10 @@ static void render_titlebar(struct sway_output *output,
 	double output_x = output->lx;
 	double output_y = output->ly;
 	int titlebar_border_thickness = config->titlebar_border_thickness;
+	int titlebar_h_padding = config->titlebar_h_padding;
+	int titlebar_v_padding = config->titlebar_v_padding;
 	enum alignment title_align = config->title_align;
 
-	// titlebar padding should account for corner radius
-	int titlebar_h_padding = corner_radius > config->titlebar_h_padding ?
-		corner_radius : config->titlebar_h_padding;
-	float titlebar_v_padding = corner_radius == (int)container_titlebar_height() ?
-		(container_titlebar_height() - config->font_height) / 2.0 : config->titlebar_v_padding;
-
 	// Single pixel bar above title
 	memcpy(&color, colors->border, sizeof(float) * 4);
 	premultiply_alpha(color, alpha);

sway/tree/container.c

@@ -676,9 +676,7 @@ void container_update_representation(struct sway_container *con) {
 }
 
 size_t container_titlebar_height(void) {
-	int config_titlebar_height = config->font_height + config->titlebar_v_padding * 2;
+	return config->font_height + config->titlebar_v_padding * 2;
-	return config->corner_radius > config_titlebar_height ?
-		config->corner_radius : config_titlebar_height;
 }
 
 void floating_calculate_constraints(int *min_width, int *max_width,