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bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window

From: martin rudalics
Subject: bug#44483: 27.1.50; Window parameter `min-margins' doesn't split window in half
Date: Fri, 6 Nov 2020 19:12:51 +0100

> 1. Open any text file, preferably with long lines (to better see the effect).
> 2. `M-x visual-line-mode RET`
> 3. `M-: (set-window-margins (selected-window) 0 150) RET`
> The number 150 is arbitrary. It's appropriate for my case (with a frame width 
> about 238 characters).
> 4. `M-: (set-window-parameter (selected-window) 'min-margins '(0 . 0)) RET`
> 5. `C-x 3`
> At this point, I expect the window to be split into two equally-sized
> side-by-side windows, but the split is at about one third of the original 
> width.

The problem is that when we split the original window, the new window
does not get its 'min-margins' parameter set and the subsequent
sanitizing step screws up things.  Please try the attached patch.

And please look also into what happens when you shrink a frame with such
large margins to a size that won't accommodate those margins any more
unless they get shrunk.  I'm afraid that the subsequent sanitizing step
might cause troubles there as well.

Thanks, martin

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