add --i3 flag to hide_edge_borders

Enables i3-compatible behavior regarding hiding the title bar on tabbed and
stacked containers with one child.

Related issues and merge requests: #3031, #3002, #2912, #2987.

1 files changed, 11 insertions, 8 deletions

diff --git a/sway/tree/view.c b/sway/tree/view.c
index ca13def7..14cc07d9 100644
--- a/sway/tree/view.c
+++ b/sway/tree/view.c
@@ -246,14 +246,17 @@ void view_autoconfigure(struct sway_view *view) {
         // In a tabbed or stacked container, the container'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.
-        enum sway_container_layout layout = container_parent_layout(con);
-        if (layout == L_TABBED && !container_is_floating(con)) {
-                y_offset = container_titlebar_height();
-                con->border_top = false;
-        } else if (layout == L_STACKED && !container_is_floating(con)) {
-                list_t *siblings = container_get_siblings(con);
-                y_offset = container_titlebar_height() * siblings->length;
-                con->border_top = false;
+        list_t *siblings = container_get_siblings(con);
+        bool show_titlebar = siblings->length > 1 || !config->hide_lone_tab;
+        if (show_titlebar && !container_is_floating(con)) {
+                enum sway_container_layout layout = container_parent_layout(con);
+                if (layout == L_TABBED) {
+                        y_offset = container_titlebar_height();
+                        con->border_top = false;
+                } else if (layout == L_STACKED) {
+                        y_offset = container_titlebar_height() * siblings->length;
+                        con->border_top = false;
+                }
         }
 
         double x, y, width, height;