Mac, PowerPoint: Add WindowSelectionChange event for changing slide selection in slide thumbnail pane
Preferably, the PowerPoint programming API for Mac should behave the same as PowerPoint for Windows.
In PowerPoint for Windows, clicking into the thumbnail pane generates WindowSelectionChange events.
However, in PowerPoint for Mac (tested: Office 2016 Insider Slow Version 16.8 (Build 171210) and also Insider Fast, clicking into the thumbnail pane DOES NOT generate WindowSelectionChange events. Changing the selected slide in the thumbnail pane does NOT generate WindowSelectionChange events either.
(Note that in Mac Office v16, the WindowSelectionChange event DOES fire for other selection changes, which was a new addtion to v16. It's just that it is missing for the selection change in the thumbnail pane)
This means that an add-in cannot correctly react to such selection changes on the Mac. E.g., the add-in's buttons may stay clickable although this is not appropriate.
Mario Vukelic commented
Big shout-out to the Office Mac team for fixing this in 16.16 (180726). Thank you!
you can even experiment the same problem on build 171205.