Opening mail sometimes opens new Geary window
This is completely impossible to reproduce, but I've seen it twice in the past week with Geary 3.36.1, and never before. So it's surely a regression from Geary 3.34 (or possibly from 3.36.0). Sometimes, when clicking on an email thread to display the thread, Geary opens a second Geary window to display the thread, so I wind up with two identical Geary windows displaying the same thing. Very strange.