TransientViewActionFactories are only ever called once per view, see here

This means that if you install a plugin that affects the view (via a TransientViewActionFactory) and getActions() has already been called for that view, your implementation of TransientViewActionFactory will not be called and your action will not happen (eg, populating a sidepanel entry etc).

We should either implement an ExtensionListener to dirty the cached transientActions when a new plugin is loaded, or do away with the caching altogether