[vte] widget: gtk4: Don't invalidate endlessly

[Christian Persch <chpe src gnome org>]

commit 2d165b61f527472a7a7eccee3e94f8ec96690245
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Mon Jul 25 22:25:08 2022 +0200

    widget: gtk4: Don't invalidate endlessly
    
    Have early returns to skip invalidation like in the gtk3 codepath.
    
    Fixes: https://gitlab.gnome.org/GNOME/vte/-/issues/2566

 src/vte.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/vte.cc b/src/vte.cc
index ed99daf6..c5f35656 100644
--- a/src/vte.cc
+++ b/src/vte.cc
@@ -10558,10 +10558,10 @@ catch (...)
 bool
 Terminal::invalidate_dirty_rects_and_process_updates()
 {
-#if VTE_GTK == 3
         if (G_UNLIKELY(!widget_realized()))
                 return false;
 
+#if VTE_GTK == 3
        if (G_UNLIKELY (!m_update_rects->len))
                return false;
 
@@ -10584,6 +10584,9 @@ Terminal::invalidate_dirty_rects_and_process_updates()
        cairo_region_destroy (region);
 
 #elif VTE_GTK == 4
+        if (G_UNLIKELY(!m_invalidated_all))
+                return false;
+
         invalidate_all();
         gtk_widget_queue_draw(m_widget);
 #endif