[gnome-shell] blur-effect: Don't paint background using actor opacity

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit f6fa08fa7553ef232e9b8134d38cd9cc1589e4d8
Author: Jonas Dreßler <verdre v0yd nl>
Date:   Fri Feb 7 10:10:58 2020 +0100

    blur-effect: Don't paint background using actor opacity
    
    The background should always be painted fully opaque, the opacity of the
    actor does not change the one of the background.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/991

 src/shell-blur-effect.c | 8 --------
 1 file changed, 8 deletions(-)
---
diff --git a/src/shell-blur-effect.c b/src/shell-blur-effect.c
index 0022327467..881592027f 100644
--- a/src/shell-blur-effect.c
+++ b/src/shell-blur-effect.c
@@ -657,16 +657,8 @@ paint_background (ShellBlurEffect     *self,
   CoglFramebuffer *framebuffer;
   float transformed_x = 0.f;
   float transformed_y = 0.f;
-  guint8 paint_opacity;
 
   framebuffer = clutter_paint_context_get_framebuffer (paint_context);
-  paint_opacity = clutter_actor_get_paint_opacity (self->actor);
-
-  cogl_pipeline_set_color4ub (self->background_fb.pipeline,
-                              paint_opacity,
-                              paint_opacity,
-                              paint_opacity,
-                              paint_opacity);
 
   clutter_actor_get_transformed_position (self->actor,
                                           &transformed_x,