[mutter] clutter-text: Fix selection color drawing

[Marco Trevisan <marcotrevi src gnome org>]

commit 76664ef89193ad9e7194a0d11b4cd27ea10d6a7d
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon May 27 17:48:41 2019 +0000

    clutter-text: Fix selection color drawing
    
    Commit cabcad185 removed the call to cogl_set_source_color4ub() before
    cogl_fill_path(), so instead of the previously assigned selection color,
    the background is drawn with the last set source.
    
    In order to honour the newly added framebuffer parameter and still apply
    the correct color, switch from cogl_fill_path() to the (deprecated!)
    cogl_framebuffer_fill_path() method.
    
    https://gitlab.gnome.org/GNOME/mutter/issues/494

 clutter/clutter/clutter-text.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
---
diff --git a/clutter/clutter/clutter-text.c b/clutter/clutter/clutter-text.c
index 9222cedfc..616655026 100644
--- a/clutter/clutter/clutter-text.c
+++ b/clutter/clutter/clutter-text.c
@@ -1975,6 +1975,7 @@ selection_paint (ClutterText     *self,
   else
     {
       /* Paint selection background first */
+      CoglPipeline *color_pipeline = cogl_pipeline_copy (default_color_pipeline);
       PangoLayout *layout = clutter_text_get_layout (self);
       CoglPath *selection_path = cogl_path_new ();
       CoglColor cogl_color = { 0, };
@@ -1987,11 +1988,19 @@ selection_paint (ClutterText     *self,
       else
         color = &priv->text_color;
 
+      cogl_color_init_from_4ub (&cogl_color,
+                                color->red,
+                                color->green,
+                                color->blue,
+                                paint_opacity * color->alpha / 255);
+      cogl_color_premultiply (&cogl_color);
+      cogl_pipeline_set_color (color_pipeline, &cogl_color);
+
       clutter_text_foreach_selection_rectangle_prescaled (self,
                                                           add_selection_rectangle_to_path,
                                                           selection_path);
 
-      cogl_path_fill (selection_path);
+      cogl_framebuffer_fill_path (fb, color_pipeline, selection_path);
 
       /* Paint selected text */
       cogl_framebuffer_push_path_clip (fb, selection_path);