evbp: Protect against SetWindow after plug has been destroyed

For some reason, Epiphany (WebKitGtk) likes to send a last SetWindow
even as it's in the process of destroying the widget. Check whether the
plug is still a GtkWindow before telling it to resize to the Window
we're being told about.

1 files changed, 8 insertions, 4 deletions

diff --git a/src/evbp.c b/src/evbp.c
index 5fcee76..648a621 100644
--- a/src/evbp.c
+++ b/src/evbp.c
@@ -202,10 +202,14 @@ evbp_set_window(NPP instance, NPWindow *window)
     /* Create a plug from the window id or just resize the existing one
      * appropriately. */
     if (priv->plug) {
-        g_debug("resizing existing plug to %ux%u", window->width,
-                window->height);
-        gtk_window_resize(GTK_WINDOW(priv->plug), window->width,
-                          window->height);
+        /* epiphany likes to throw one more set_window even after the widget
+         * has been destroyed. */
+        if (GTK_IS_WINDOW(priv->plug)) {
+            g_debug("resizing existing plug to %ux%u", window->width,
+                    window->height);
+            gtk_window_resize(GTK_WINDOW(priv->plug), window->width,
+                              window->height);
+        }
     } else {
         Window id = (Window)window->window;