[gucharmap] charmap: Conditionalise forcing the light theme on gtk < 3.22

[Christian Persch <chpe src gnome org>]

commit a5b046870b62393bb10ed649072c00a0c88d5e1e
Author: Christian Persch <chpe gnome org>
Date:   Tue Nov 15 21:10:00 2016 +0100

    charmap: Conditionalise forcing the light theme on gtk < 3.22
    
    Apparently this is fixed on gtk+ 3.22, so only force the variant
    to 'light' on < 3.22.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=741939#c28

 gucharmap/main.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/gucharmap/main.c b/gucharmap/main.c
index 877398b..a07403f 100644
--- a/gucharmap/main.c
+++ b/gucharmap/main.c
@@ -275,8 +275,12 @@ main (int argc, char **argv)
 
   g_application_register (G_APPLICATION (application), NULL, NULL);
 
-  /* Gucharmap doesn't work right with the dark theme, see #741939 */
-  g_object_set (gtk_settings_get_default (), "gtk-application-prefer-dark-theme", FALSE, NULL);
+  /* Gucharmap doesn't work right with the dark theme, see #741939. 
+   * Apparently this got fixed in gtk+ some time before 3.22, so
+   * only work around this on older versions.
+   */
+  if (gtk_check_version (3, 22, 0) != NULL /* < 3.22.0 */)
+    g_object_set (gtk_settings_get_default (), "gtk-application-prefer-dark-theme", FALSE, NULL);
 
   window = gucharmap_window_new (application);