[gtk/wip/chergert/glproto] restore prev alpha

[Christian Hergert <chergert src gnome org>]

commit 2e698b6f55d9d596a83e6a240ed6f5077c196997
Author: Christian Hergert <chergert redhat com>
Date:   Fri Feb 12 14:33:33 2021 -0800

    restore prev alpha

 gsk/next/gskglrenderjob.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/gsk/next/gskglrenderjob.c b/gsk/next/gskglrenderjob.c
index c45eaa7885..d5e07dec08 100644
--- a/gsk/next/gskglrenderjob.c
+++ b/gsk/next/gskglrenderjob.c
@@ -3551,6 +3551,7 @@ gsk_gl_render_job_visit_node_with_offscreen (GskGLRenderJob       *job,
   gsk_gl_render_job_pop_modelview (job);
   gsk_gl_render_job_set_viewport (job, &prev_viewport, NULL);
   gsk_gl_render_job_set_projection (job, &prev_projection);
+  gsk_gl_render_job_set_alpha (job, prev_alpha);
   gsk_gl_command_queue_bind_framebuffer (job->command_queue, prev_fbo);
 
   job->offset_x = offset_x;