Respect border settings when rendering lone tabbed/stacked child

In i3, when a child of a tabbed or stacked container has no siblings,
its border settings are respected.

This patch achieves the same effect by rendering a lone tabbed/stacked
child as if it's a linear container. This makes the border settings be
respected.

Over in view_autoconfigure, we compensate for this by only adjusting
`y_offset` if there's multiple children.

1 files changed, 7 insertions, 0 deletions

diff --git a/sway/desktop/render.c b/sway/desktop/render.c
index 1a72f752..c1fa0c8c 100644
--- a/sway/desktop/render.c
+++ b/sway/desktop/render.c
@@ -781,6 +781,13 @@ static void render_containers_stacked(struct sway_output *output,
 
 static void render_containers(struct sway_output *output,
                 pixman_region32_t *damage, struct parent_data *parent) {
+        if (parent->children->length == 1) {
+                struct sway_container *child = parent->children->items[0];
+                if (child->view) {
+                        render_containers_linear(output, damage, parent);
+                        return;
+                }
+        }
         switch (parent->layout) {
         case L_NONE:
         case L_HORIZ: