Last shell frame isn't sent to the display

Seems like a bug somewhere in the lower layers from my quick investigation, from what i can see:
 * It only fails on the phone
 * When it has failed on the phone, if you drag the scope to do a scope change, the header will come back
 * When doing that kind of change between scopes, we don't do any re-rendering, the fact that it comes back, hints me that somehow something was "forgoten" to render in the previous step

Added this patch

=== modified file 'plugins/Dash/CardCreator.js'
--- plugins/Dash/CardCreator.js 2014-05-15 09:08:51 +0000
+++ plugins/Dash/CardCreator.js 2014-05-21 09:21:28 +0000
@@ -289,7 +289,9 @@
                 readonly property string title: cardData && cardData["title"] || ""; \n\
                 property bool asynchronous: true; \n\
                 property bool showHeader: true; \n\
- implicitWidth: childrenRect.width; \n';
+ implicitWidth: childrenRect.width; \n\
+ onShowHeaderChanged: console.log("showHeader", root, showHeader); \n\
+ Rectangle { color: "red"; opacity: 0.5; anchors.fill: parent; visible: showHeader }';

     var hasArt = components["art"] && components["art"]["field"] || false;
     var hasSummary = components["summary"] || false;

And the showHeader changes to true, but the times it fails the rectangle is not seen. Seems indeed as if we're missing some last repaint of something :-S

So I run the same unity8 binary both inside an unity7 X11 session and standalone as a Mir session and we can reproduce the bug in the standalone Mir session but not inside the unity7 X11 session so it would seem to me that there is actually a bug in the lower layers (unity-mir, mir, something?)

What Mir version is it?

0.1.9+14.10.20140430.1-0ubuntu1

seems to be fixed in the latest mir/devel, in the progress of promoting 0.2.0

likely a duplicate of
https://bugs.launchpad.net/mir/+bug/1321861

Sounds like the fix (if any) appeared in 0.2.0