Vim, Mintty, and mouse resizing no longer works.

Thomas Wolff
Sat Jul 11 20:44:00 GMT 2015

Am 11.07.2015 um 20:11 schrieb James Darnley:
> On 2015-07-11 13:59, Thomas Wolff wrote:
>> Am 11.07.2015 um 02:52 schrieb James Darnley:
>>> Hi Thomas
>>> Unfortunately I have a complaint to make.
>>> When using the latest Mintty release I can no longer use the mouse to
>>> resize split windows in Vim.  In 1.1.3, I can drag any window separator
>>> around to change the size of them.  In 2.0.2 Aim appears to interpret
>>> the mouse as trying to make a visual section in one window.
>>> I tried quickly to narrow down which commit might have introduced the
>>> problem using git bisect, unfortunately it was slowed down by some
>>> commits not compiling.  However it did lead to producing this message.
>>>> 4765275a7cfd9fadc74aedc1191de5390fa11c09 is the first bad commit
>>>> commit 4765275a7cfd9fadc74aedc1191de5390fa11c09
>>>> Author: Thomas Wolff <>
>>>> Date:   Tue Jun 16 14:45:20 2015 +0200
>>>>       fix restructuring
>>> If I checkout the commit immediately preceding this the mouse works as I
>>> expect.  I cannot explain why this might be the case as it looks like
>>> there are no relevant code changes in that commit.
>>> I will try to investigate some more but I wanted to let you know.
>> The commit you refer to did not change any actual code, so maybe
>> something in the environment is involved.
>> Please describe a reproducible test case. How would you setup split
>> windows in vim? How would you try to resize them?
>> Also, did you use one of the new mouse options, like MiddleClickAction?
>> Thomas
> I don't know if you know vim so this might be verbose.
> To make a vertical split, run the command :vs
> To open vim with a vertical split: vim -O file1 file2
> (That is a literal colon, v, and s and an uppercase letter O)
> To make a horizontal split, run the command :sp
> To open vim with a vertical split: vim -o file1 file2
> (That is a literal colon, s, and p and an lowercase letter O)
> To resize (when it works) just left click on the separator and drag.
> Much like resizeable frames in a web page or a Windows window border
> (but you don't get the double ended arrow cursor)
Hi James,
thanks for the step-by-step description. I cannot reproduce, however, a 
working resize. I've tried with mintty 1.1.3 (freshly compiled, should 
that make a difference) on cygwin-32, and mintty 1.2 on cygwin-64.
With a horizontal split, vim does not show me any separator at all.
With a vertical split, there is a vertical bar ("|") separator, but 
nothing happens on click-and-drag. Is some additional vim configuration 
needed to enable that feature? General mouse enabling perhaps? (I once 
heard this would need to be fiddled about in vim and emacs and I wonder 
why these traditional editors make basic things so troublesome for the 
users; my own editor, mined, provides all mouse functions out-of-the-box...)
Please, additional details.

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