[gtk/matthiasc/for-master] Revert "ngl: Remove a few redundant checks"

[Matthias Clasen <matthiasc src gnome org>]

commit 5f664dbbbb7f208968d5ca94e166aa392249c432
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Mar 8 08:10:25 2021 -0500

    Revert "ngl: Remove a few redundant checks"
    
    This reverts commit 4375f8e382ef035d970dd255f56d1a7470c1a78c.
    
    These were not redundant after all, as pointed out by Timm.

 gsk/ngl/gsknglrenderjob.c | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/gsk/ngl/gsknglrenderjob.c b/gsk/ngl/gsknglrenderjob.c
index f2dec8d9e8..5832e557b5 100644
--- a/gsk/ngl/gsknglrenderjob.c
+++ b/gsk/ngl/gsknglrenderjob.c
@@ -2805,6 +2805,9 @@ gsk_ngl_render_job_visit_blur_node (GskNglRenderJob     *job,
 
   g_assert (blur_radius > 0);
 
+  if (node_is_invisible (child))
+    return;
+
   key.pointer = node;
   key.pointer_is_child = FALSE;
   key.scale_x = job->scale_x;
@@ -2903,6 +2906,9 @@ gsk_ngl_render_job_visit_color_matrix_node (GskNglRenderJob     *job,
   GskNglRenderOffscreen offscreen = {0};
   float offset[4];
 
+  if (node_is_invisible (child))
+    return;
+
   offscreen.bounds = &node->bounds;
   offscreen.reset_clip = TRUE;