[gnome-builder/wip/gtk4-port] libide/gui: tweak libadwaita tab styling

[Christian Hergert <chergert src gnome org>]

commit d1a463a30a1f276cdccf8e2cc83d957f74c3dd4e
Author: Christian Hergert <chergert redhat com>
Date:   Wed Apr 20 17:46:35 2022 -0700

    libide/gui: tweak libadwaita tab styling

 src/libide/gui/style.css | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/src/libide/gui/style.css b/src/libide/gui/style.css
index dfecc5105..f146514c9 100644
--- a/src/libide/gui/style.css
+++ b/src/libide/gui/style.css
@@ -60,3 +60,9 @@ notificationstack button {
   padding: 0;
   background: none;
 }
+
+/* Make new libadwaita match closer to libpanel frame header */
+tabboxchild {
+ margin-top: 2px;
+ margin-bottom: 2px;
+}