Merge branch 'master' into stable-4.4

Merge branch 'master' into stable-4.4

* master:
  Fix property page for git configs if the system config is inaccessible
  Initialize dialog settings when a remote is configured
  Enable copying source branch in "Create Branch" dialog to clipboard
  Fix NPE in CloneDestinationPage.checkPreviousPageSelections()
  Fix NPE in SourceBranchPage/CloneDestinationPage.revalidate()
  Fix NPE in BranchOperationUI.show()
  Avoid NPE in CommitGraphTable.mapElement()
  Test stability: wait for specific child node after expansion
  Test stability: wait for add to index/remove from index jobs
  Test stability: wait for index diff cache update
  Test stability: after clicking finish, wait for shell to close.
  Harmonize Gerrit fetch and push operation availability

Change-Id: I09af5af38d8581845b772ef8a13b31522aae57ec
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>