[gnome-builder/wip/gtk4-port] libide/gui: fix style for check image

[Christian Hergert <chergert src gnome org>]

commit 987b1ba739fc184186ff33b7fe6268059558b661
Author: Christian Hergert <chergert redhat com>
Date:   Tue Apr 5 16:15:16 2022 -0700

    libide/gui: fix style for check image
    
    We only want the icon set when it is checked.

 src/libide/gui/style.css | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/src/libide/gui/style.css b/src/libide/gui/style.css
index 510f69c3a..84ed3752c 100644
--- a/src/libide/gui/style.css
+++ b/src/libide/gui/style.css
@@ -14,9 +14,13 @@ window.preferences list check {
   outline: none;
   box-shadow: none;
   border: none;
-  -gtk-icon-source: -gtk-icontheme('object-select-symbolic');
+  color: @window_fg_color;
+  -gtk-icon-source: none;
   -gtk-icon-size: 18px;
 }
+window.preferences list check:checked {
+  -gtk-icon-source: -gtk-icontheme('object-select-symbolic');
+}
 stylevariantpreview widget.wallpaper {
   border-radius: 6px;
   box-shadow: 0 0 9px 1px rgba(0,0,0,.2);