input/cursor: correctly transfer focus when using tablet pen

Fixes #4819.

This commit ensures that `seat_set_focus` is called to transfer focus
when a window is selected via a pen. Previously, it would race with
`node_at_coords`, and only properly transfer focus if its returned
`surface` was NULL.

1 files changed, 6 insertions, 2 deletions

diff --git a/sway/input/cursor.c b/sway/input/cursor.c
index f2c91bab..0649f468 100644
--- a/sway/input/cursor.c
+++ b/sway/input/cursor.c
@@ -520,8 +520,8 @@ static void handle_tablet_tool_position(struct sway_cursor *cursor,
         double sx, sy;
         struct wlr_surface *surface = NULL;
         struct sway_seat *seat = cursor->seat;
-        node_at_coords(seat, cursor->cursor->x, cursor->cursor->y,
-                &surface, &sx, &sy);
+        struct sway_node *focused_node = node_at_coords(seat, cursor->cursor->x,
+                cursor->cursor->y, &surface, &sx, &sy);
         struct sway_tablet_tool *sway_tool = tool->data;
 
         if (!surface || !wlr_surface_accepts_tablet_v2(tablet->tablet_v2, surface)) {
@@ -534,6 +534,10 @@ static void handle_tablet_tool_position(struct sway_cursor *cursor,
         wlr_tablet_v2_tablet_tool_notify_proximity_in(sway_tool->tablet_v2_tool,
                 tablet->tablet_v2, surface);
 
+        if (focused_node && config->focus_follows_mouse != FOLLOWS_NO) {
+                seat_set_focus(seat, focused_node);
+        }
+
         wlr_tablet_v2_tablet_tool_notify_motion(sway_tool->tablet_v2_tool, sx, sy);
 }