3106: display spinner when modal dialogs are communicating with server.
Merge branch 'master' into 3106-modal-loading-indicator
Merge branch 'master' into 3106-modal-loading-indicator
3106: spinner to the left to avoid shifting down elements when it is visible
Merge branch 'master' into 3106-modal-loading-indicator
Merge branch 'master' into 3106-modal-loading-indicator
3106: show the spinner in the middle of the popup header
Merge branch 'master' into 3106-modal-loading-indicator
closes #3106
Merge branch '3106-modal-loading-indicator'