[gnome-builder] prefs: tweak styling of groups/rows

[Christian Hergert <chergert src gnome org>]

commit 1bc3396383b4cfb155dba9f1b56a1c670b4261d5
Author: Christian Hergert <chergert redhat com>
Date:   Fri Jan 7 14:10:01 2022 -0800

    prefs: tweak styling of groups/rows
    
    Until we get to GTK 4, we can at least soften these up a bit.

 src/libide/themes/themes/Adwaita-shared.css | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
---
diff --git a/src/libide/themes/themes/Adwaita-shared.css b/src/libide/themes/themes/Adwaita-shared.css
index 9fb276562..be24c1b17 100644
--- a/src/libide/themes/themes/Adwaita-shared.css
+++ b/src/libide/themes/themes/Adwaita-shared.css
@@ -98,3 +98,29 @@ window.development-version headerbar label:not(:disabled) {
 window.development-version headerbar .suggested-action label {
   color: @theme_selected_fg_color;
 }
+
+
+/* preferences overrides */
+dzlpreferencesgroup frame,
+dzlpreferencesgroup .frame {
+  background: @content_view_bg;
+  border-radius: 9px;
+}
+dzlpreferencesgroup frame border,
+dzlpreferencesgroup .frame border {
+  border-radius: 9px;
+}
+dzlpreferencesgroup list {
+  background: transparent;
+}
+dzlpreferencesgroup list row {
+  min-height: 28px;
+}
+dzlpreferencesgroup list row:first-child {
+  border-top-left-radius: 9px;
+  border-top-right-radius: 9px;
+}
+dzlpreferencesgroup list row:last-child {
+  border-bottom-left-radius: 9px;
+  border-bottom-right-radius: 9px;
+}