In the Importer > Animation tab, you can create & delete animation Events using the "+" button & delete hotkey, BUT the contextual menu options (RMB-Click on Events timeline: Add/Delete Animation Event) does nothing... events are not added/deleted.

repro:
- open attached project or any FBX file with animation
- select the FBX file and select the Animation tab in the Inspector
- in the Events section, RMB-click the timeline and use the Add/Delete Animation Event options...
result: nothing happens.
expected: Add & Delete options add & delete animation events on the Inspector Events timeline.

this is a regression.
repro in…
Version 2019.2.0a6 (5612105fae18)
Branch: trunk

Not repro in…
Version 2019.2.0a5 (d86ab155337e)
Branch: trunk