Comment 27 for bug 1265898

Created attachment 9106092
Screenshot_20191104_014746.png

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:70.0) Gecko/20100101 Firefox/70.0

Steps to reproduce:

Set mail.tabs.drawInTitlebar to true (and it does not matter how one does this).

Actual results:

Thunderbird will not open fully maximised; there is small gap between the top of the screen and the top of the window.

Expected results:

When Thunderbird is set to open maximised - which it should do if (for one thing?) it is maximised when it is closed - it should open (fully) maximised.

Extra information is as follows.

I have experienced this bug constantly since the tabs-in-titlebar feature arrived.

Theme - Thunderbird or OS - seems not to affect the problem.

I have a Hi-DPI system. Some details of my system are as follows.

OS: Linux Mint 19.2 Tina x86_64
Host: 20KHCTO1WW ThinkPad X1 Carbon 6th
Resolution: 2560x1440 @ 60.01Hz
DE: Cinnamon 4.2.4
WM: Mutter (Muffin)
GPU: Intel UHD Graphics 620

I am surprised that no-one has reported this bug before. Perhaps they have and the Bugzilla search function failed to find the relevant report(s).

I attach a screenshot. The vertical gap at issue is small but noticeable enough to irritate.