[gnome-shell/T27795: 43/138] calendarMenu: Re-style the "Clear All" button in the calendar popup menu

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 195c4065313765f155342c0d80b39e8d9693ce1e
Author: Mario Sanchez Prada <mario endlessm com>
Date:   Fri Nov 3 11:55:20 2017 +0000

    calendarMenu: Re-style the "Clear All" button in the calendar popup menu
    
    This button was newly introduced with GNOME Shell, and the upstream
    style doesn't play well with our style modifications to the background
    of the menu, so replace it with a solid 1px border of the same colour
    than other lines in the menu, to make it clear to the user that there
    is a button in there.
    
    https://phabricator.endlessm.com/T19807

 data/theme/gnome-shell-sass/_endless.scss | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/data/theme/gnome-shell-sass/_endless.scss b/data/theme/gnome-shell-sass/_endless.scss
index 7c781792ce..2a46fafdee 100644
--- a/data/theme/gnome-shell-sass/_endless.scss
+++ b/data/theme/gnome-shell-sass/_endless.scss
@@ -331,6 +331,17 @@ popup-separator-menu-item {
     &:clicked { @extend %endless-button-clicked; }
 }
 
+// Calendar Menu
+
+#calendarArea {
+    .message-list {
+        .message-list-clear-button.button {
+            box-shadow: none;
+            border: 1px solid #454f52;
+        }
+    }
+}
+
 // Hot Corner
 
 #panel {