[gtk] gl renderer: Fix push/pop modelview behavior

[Timm Bäder <baedert src gnome org>]

commit 6b42e5b433a8fcecaf8d0b0cc173ccbb909b6c24
Author: Timm Bäder <mail baedert org>
Date:   Sat Jun 29 08:57:27 2019 +0200

    gl renderer: Fix push/pop modelview behavior

 gsk/gl/gskglrenderops.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gsk/gl/gskglrenderops.c b/gsk/gl/gskglrenderops.c
index a3e4e8675e..b23e8c5cde 100644
--- a/gsk/gl/gskglrenderops.c
+++ b/gsk/gl/gskglrenderops.c
@@ -339,9 +339,12 @@ ops_set_modelview_internal (RenderOpBuilder *builder,
   RenderOp op;
   graphene_matrix_t matrix;
 
+#if 0
+  XXX This is not possible if we want pop() to work.
   if (builder->current_program &&
       gsk_transform_equal (builder->current_program_state->modelview, transform))
     return;
+#endif
 
   gsk_transform_to_matrix (transform, &matrix);