Git: Fix Instant Blame not working after first editor open

For the very first opened editor, we were unable to get a
workingDirectory with currentState().currentFileTopLevel()
within the lambda setupBlameForEditor(). The workingDirectory
was always empty and therefore Instant Blame only worked
after a force or editor change.

This and also some still failing ClearCase auto tests were
broken by ce9826ae6e.

Change-Id: I06239351274cf3aa01be66bc614ec8991274b4a6
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/vcsbase/vcsbaseplugin.cpp

@@ -309,10 +309,13 @@ void StateListener::slotStateChanged()
         state.clearPatchFile(); // Need a repository to patch
 
     qCDebug(stateLog).noquote() << "VC:" << (vc ? vc->displayName() : QString("None")) << state;
-    QTimer::singleShot(500, this, [this, state, vc] {
+
+    auto updateState = [this, state, vc] {
         EditorManager::updateWindowTitles();
         emit stateChanged(state, vc);
-    });
+    };
+    updateState();
+    QTimer::singleShot(500, this, updateState); // QTCREATORBUG-31815
 }
 
 } // namespace Internal