[polari] ui: Highlight room header while popover is shown

[Florian Müllner <fmuellner src gnome org>]

commit d6fa2ebb3c14820b22942ed169695f3d8fdfc3f0
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Oct 14 04:06:56 2015 +0200

    ui: Highlight room header while popover is shown
    
    Commit 010fd09 added a hover highlight to indicate that the header
    is interactive, however this does not help to visually root the
    popover when shown - add a separate style when the header is toggled
    for that purpose.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=755158

 data/resources/application.css |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/data/resources/application.css b/data/resources/application.css
index 4ea3973..a4793c4 100644
--- a/data/resources/application.css
+++ b/data/resources/application.css
@@ -46,6 +46,10 @@
     border-bottom: 1px solid alpha(@borders, 0.55);
 }
 
+.polari-room-list .room-list-header:checked {
+    background-color: @polari_dark_bg_color;
+}
+
 .polari-room-list .list-row {
     padding-left: 8px;
 }