[gnome-panel/wip/geiger/adwaita: 1/2] Adwaita: remove CSS from tasklist-button

[Sebastian Geiger <segeiger src gnome org>]

commit 3aacfb2e3ef0a5b596a5106bbed89e5902aa135a
Author: Sebastian Geiger <sbastig gmx net>
Date:   Sat Feb 29 16:42:28 2020 +0100

    Adwaita: remove CSS from tasklist-button
    
    This removes all CSS from the tasklist-button. We do not
    want to style the tasklist-button but only the box inside it.
    
    In particular, this also removes a one pixel white box-shadow
    from the tasklist-button which gets added by the default
    Adwaita themes.

 data/theme/Adwaita/gnome-panel.css | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)
---
diff --git a/data/theme/Adwaita/gnome-panel.css b/data/theme/Adwaita/gnome-panel.css
index e01a69cb0..db51f39b8 100644
--- a/data/theme/Adwaita/gnome-panel.css
+++ b/data/theme/Adwaita/gnome-panel.css
@@ -61,10 +61,7 @@ gp-arrow-button:active {
 #tasklist-button:hover,
 #tasklist-button:active,
 #tasklist-button:checked {
-  padding: 0;
-  margin: 0;
-  border: 0;
-  background-image: none;
+  all: unset;
 }
 
 #tasklist-button > box {