1194633 - Nightly: main window's system buttons are not working in 32-bit Windows 10 after July 13, 2015

Status: RESOLVED DUPLICATE of bug 1188778

(Thunderbird :: Mail Window Front End, defect)

Description

[psn]

User Agent: Mozilla/5.0 (Windows NT 10.0; rv:43.0) Gecko/20100101 Firefox/43.0
Build ID: 20150813030208

Steps to reproduce:

OS: Windows 10, 32-bit build 10240 (so far it is insider build)

Unpack 32-bit nightly build into usual Thunderbird's directory.

Start Thunderbird.
In my configuration it shows passord dialog - just press Cancel.
Now try to close (or minimize/maximize) the main window using system button in the top right corner.


Actual results:

In builds before and including July 13, 2015 all goes well.

There were no 32-bit builds before July 23, 2015 (so it started with version 42 and is still present in version 43).
Starting from this one - system buttons cannot be pressed and are not highlighted when mouse hovers over.
Double click on the buttons does the same as double click on empty caption area - toggles between maximized  and normal window sizes.
There was no difference when I tried safe mode.

Alt-F4 key shortcut and  File - Exit do close the window normally.



Expected results:

System buttons should behave in standard way.

Comment 1

[Wayne Mery (:wsmwk)]

Thanks for reporting this.
It is the same as bug 1188778