Fix tab border issues

sway/desktop/output.c

@@ -709,6 +709,7 @@ static void render_tab_content(struct sway_output *output,
 	float output_scale = output->wlr_output->scale;
 	float color[4];
 
+	if (view->border != B_NONE) {
 		if (view->border_left) {
 			memcpy(&color, colors->child_border, sizeof(float) * 4);
 			color[3] *= con->alpha;
@@ -742,6 +743,7 @@ static void render_tab_content(struct sway_output *output,
 			render_rect(output->wlr_output, damage, &box, color);
 		}
 	}
+}
 
 /**
  * Render a container's children using the L_TABBED layout.

sway/tree/view.c

@@ -167,32 +167,53 @@ void view_autoconfigure(struct sway_view *view) {
 
 	double x, y, width, height;
 	x = y = width = height = 0;
+	double y_offset = 0;
+
+	// In a tabbed or stacked container, the swayc's y is the top of the title
+	// area. We have to offset the surface y by the height of the title bar, and
+	// disable any top border because we'll always have the title bar.
+	if (view->swayc->parent->layout == L_TABBED) {
+		y_offset = config->border_thickness * 2 + config->font_height;
+		view->border_top = 0;
+	} else if (view->swayc->parent->layout == L_STACKED) {
+		y_offset = config->border_thickness * 2 + config->font_height;
+		y_offset *= view->swayc->parent->children->length;
+		view->border_top = 0;
+	}
+
 	switch (view->border) {
 	case B_NONE:
 		x = view->swayc->x;
-		y = view->swayc->y;
+		y = view->swayc->y + y_offset;
 		width = view->swayc->width;
-		height = view->swayc->height;
+		height = view->swayc->height - y_offset;
 		break;
 	case B_PIXEL:
 		x = view->swayc->x + view->border_thickness * view->border_left;
-		y = view->swayc->y + view->border_thickness * view->border_top;
+		y = view->swayc->y + view->border_thickness * view->border_top + y_offset;
 		width = view->swayc->width
 			- view->border_thickness * view->border_left
 			- view->border_thickness * view->border_right;
-		height = view->swayc->height
+		height = view->swayc->height - y_offset
 			- view->border_thickness * view->border_top
 			- view->border_thickness * view->border_bottom;
 		break;
 	case B_NORMAL:
 		// Height is: border + title height + border + view height + border
 		x = view->swayc->x + view->border_thickness * view->border_left;
-		y = view->swayc->y + config->font_height + view->border_thickness * 2;
 		width = view->swayc->width
 			- view->border_thickness * view->border_left
 			- view->border_thickness * view->border_right;
+		if (y_offset) {
+			y = view->swayc->y + y_offset;
+			height = view->swayc->height - y_offset
+				- view->border_thickness * view->border_bottom;
+		} else {
+			y = view->swayc->y + config->font_height + view->border_thickness * 2
+				+ y_offset;
 			height = view->swayc->height - config->font_height
 				- view->border_thickness * (2 + view->border_bottom);
+		}
 		break;
 	}