[gnome-shell] panel: Update .solid style on session mode changes

[Florian Müllner <fmuellner src gnome org>]

commit e02d6e52859551014fbc646f0681ef8a481660a1
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon May 29 17:20:36 2017 +0200

    panel: Update .solid style on session mode changes
    
    The .solid style isn't supposed to apply for modes that don't support
    windows, but for this to work we have to update the style on session
    mode changes.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=783202

 js/ui/panel.js |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/js/ui/panel.js b/js/ui/panel.js
index a7d63d2..83fda0e 100644
--- a/js/ui/panel.js
+++ b/js/ui/panel.js
@@ -1015,6 +1015,8 @@ const Panel = new Lang.Class({
         else
             Main.messageTray.bannerAlignment = Clutter.ActorAlign.CENTER;
 
+        this._updateSolidStyle();
+
         if (this._sessionStyle)
             this._removeStyleClassName(this._sessionStyle);