[EMailFormatter] Use GdkRGBA and GtkStyleContext to get theme colors

It could happen that header text color had been picked white one time,
but the other time black as expected (for me usually when I started
Evolution in Calendar and moved to Mail view, the header text color
was white, while when starting in Mail view it was black). The change
to use GtkStyleContext is there only as a cleanup from deprecated
GtkStyle, and to make things easier too, because both GtkStyle
and the GtkStyleContext had set white color for some reason.

1 files changed, 2 insertions, 2 deletions

diff --git a/e-util/e-misc-utils.c b/e-util/e-misc-utils.c
index 97e5c2d37e..59e6e67eb2 100644
--- a/e-util/e-misc-utils.c
+++ b/e-util/e-misc-utils.c
@@ -1149,7 +1149,7 @@ e_int_compare (gconstpointer x,
  * Returns: a 24-bit color value
  **/
 guint32
-e_color_to_value (GdkColor *color)
+e_color_to_value (const GdkColor *color)
 {
 	GdkRGBA rgba;
 
@@ -1173,7 +1173,7 @@ e_color_to_value (GdkColor *color)
  * Returns: a 24-bit color value
  **/
 guint32
-e_rgba_to_value (GdkRGBA *rgba)
+e_rgba_to_value (const GdkRGBA *rgba)
 {
 	guint16 red;
 	guint16 green;