[mutter] shadow-factory: Don't set implicit Cogl material

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

commit 26147afb08e90d154eac7ad77168a730fc0fd284
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Nov 22 11:36:44 2019 +0100

    shadow-factory: Don't set implicit Cogl material
    
    We only draw with non-deprecated API already, so there is no reason to
    set the source material.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/935

 src/compositor/meta-shadow-factory.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)
---
diff --git a/src/compositor/meta-shadow-factory.c b/src/compositor/meta-shadow-factory.c
index ee94e2b4c..c4228fa37 100644
--- a/src/compositor/meta-shadow-factory.c
+++ b/src/compositor/meta-shadow-factory.c
@@ -216,11 +216,13 @@ meta_shadow_paint (MetaShadow      *shadow,
   int dest_x[4];
   int dest_y[4];
   int n_x, n_y;
-  gboolean source_updated = FALSE;
 
   if (clip && cairo_region_is_empty (clip))
     return;
 
+  cogl_pipeline_set_color4ub (shadow->pipeline,
+                              opacity, opacity, opacity, opacity);
+
   if (shadow->scale_width)
     {
       n_x = 3;
@@ -298,14 +300,6 @@ meta_shadow_paint (MetaShadow      *shadow,
           if (overlap == CAIRO_REGION_OVERLAP_OUT)
             continue;
 
-          if (!source_updated)
-            {
-              cogl_pipeline_set_color4ub (shadow->pipeline,
-                                          opacity, opacity, opacity, opacity);
-              cogl_set_source (shadow->pipeline);
-              source_updated = TRUE;
-            }
-
           /* There's quite a bit of overhead from allocating a new
            * region in order to find an exact intersection and
            * generating more geometry - we make the assumption that