Default Hide/Show Ribbon button for TaskPaneApp and ContentAddin
It would be nice to have a default ribbon button to hide/show the addin provided content. In the desktop version (at least in 2013 - haven't tested 2016) it is possible to close and not be able to get the taskpane.
This might also make the addins more discoverable.
The default should be overrideable in the manifest. i.e. change icon, replace, remove.