[mutter/gnome-3-30] tests: Don't check pixels outside actor allocation

[Marco Trevisan <marcotrevi src gnome org>]

commit 5e4cb54bb5ced1a5829fb903fe1729f5da248b0c
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Dec 18 12:54:09 2018 +0000

    tests: Don't check pixels outside actor allocation
    
    The actor-shader-effect test actors are 50px wide, but we check the 51st
    pixel. This went along undetected until "clutter: Avoid rounding
    compensation when invalidating 2D actors" because the paint volumes were
    made slightly bigger and the shaders paint all over them (I guess nobody
    noticed those actors being actually ~52px wide).
    
    Update the test to check the middle of the opposite edge, so we keep neatly
    rounded numbers.
    
    
    (cherry picked from commit 1d73533f786b8f83fcffae7e5f5965d3b1f4e57a)

 clutter/tests/conform/actor-shader-effect.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/clutter/tests/conform/actor-shader-effect.c b/clutter/tests/conform/actor-shader-effect.c
index d3ddd384f..93a43ea8b 100644
--- a/clutter/tests/conform/actor-shader-effect.c
+++ b/clutter/tests/conform/actor-shader-effect.c
@@ -230,13 +230,13 @@ paint_cb (ClutterStage *stage,
   gboolean *was_painted = data;
 
   /* old shader effect */
-  g_assert_cmpint (get_pixel (50, 50), ==, 0xff0000);
+  g_assert_cmpint (get_pixel (0, 25), ==, 0xff0000);
   /* new shader effect */
-  g_assert_cmpint (get_pixel (150, 50), ==, 0x00ffff);
+  g_assert_cmpint (get_pixel (100, 25), ==, 0x00ffff);
   /* another new shader effect */
-  g_assert_cmpint (get_pixel (250, 50), ==, 0xff00ff);
+  g_assert_cmpint (get_pixel (200, 25), ==, 0xff00ff);
   /* new shader effect */
-  g_assert_cmpint (get_pixel (350, 50), ==, 0x00ffff);
+  g_assert_cmpint (get_pixel (300, 25), ==, 0x00ffff);
 
   *was_painted = TRUE;
 }