1506481 - Thunderbird window size is wrong on launch when previously snapped to side

Status: RESOLVED DUPLICATE of bug 1413133

(Thunderbird :: OS Integration, defect)

Description

[omgitsraven]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0

Steps to reproduce:

On Windows 10:
1) Launch Thunderbird.
2) Drag its window to the right (or left) side of the screen, until the outline appears to indicate that it's going to snap; release the mouse button so it snaps.
3) Quit Thunderbird, then launch it again.


Actual results:

There's a gap between the Thunderbird window and the bottom and side of the screen.


Expected results:

It should re-launch in the exact same place that it was when it quit.

I know this sounds a lot like https://bugzilla.mozilla.org/show_bug.cgi?id=783899 , but that bug was for when the window is maximized (full-screen), and this is for when it is snapped (half-screen). (Actually, the last comment on that bug is someone pointing out this bug, but it seemed like a new report was more appropriate than tacking it onto the end of an already-solved bug, however similar.)