In other words , an option to make headers shrink to a minimal size when toolbar are minimized .
Because it is really nice when minimized headers takes minimal amount of space .

Previously this mod had a bug that made headers work like this by default .
So , i am basically asking to make this old bug to be a toggleable feature .

Here is an example of my bugged toolbars from some "old" 2.0 version .
https://imgur.com/a/TkP3vWX
Notice how neet the minimized toolbar looks when it is on the left side of the screen :D

I will take it under consideration when making bigger changes. I don't want to have options because it's hard to maintain and test but maybe I will find a solution which will fulfill most needs.

If you really miss it you can change it by yourself but you need to do it after every update again.
Instead of calculating width of a toolbar return zero.

src/gui/toolbar/Toolbar.lua:176: return self:content():width() change to return 0

After this change lock/unlock toolbar and it will behave in a desired way.