Required information!
OS version: Win2k/WinXP/Vista/Win7/Win8   SP?   x86/x64
ConEmu version: 15.1.11.0
Far version (if you are using Far Manager): NA

*Bug description*
After conemu loses focus and regains it igain, its window width decreases automatically.

Pls see a video:
https://www.dropbox.com/s/x2orrx28tq2dav6/resizing.avi?dl=0

*Steps to reproduction*
1. Open conemu
2. Click on a desktop, so that conemu will loose focus
3. Regain focus by using a global shortcut to minimize/restore conemu. Repeat. 

Tried various combinations of options available in Main -> Size & Pos - effect is the
same. The only way size stays the same is when "window size" is set to maximized or
a fullscreen (which is not an option for me as I need multiple windows [not tabs] opened
at the same time)