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-rw-r--r--xwayland/xwm.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/xwayland/xwm.c b/xwayland/xwm.c
index 917aaaff..c39f640f 100644
--- a/xwayland/xwm.c
+++ b/xwayland/xwm.c
@@ -885,6 +885,8 @@ static const struct wlr_addon_interface surface_addon_impl = {
static void xwayland_surface_associate(struct wlr_xwm *xwm,
struct wlr_xwayland_surface *xsurface, struct wlr_surface *surface) {
+ assert(xsurface->surface == NULL);
+
wl_list_remove(&xsurface->unpaired_link);
wl_list_init(&xsurface->unpaired_link);
xsurface->surface_id = 0;