tmux breaks mouse support in vim

[Carbolymer]

tmux version: 2.9a

steps to reproduce:

1. run tmux

2. disable mouse support via set -g mouse off

3. run vim

4. enable mouse support in vim: set mouse=a

5. run two times :vsp

6. Windows setup in VIM:   A | B | C

7. Drag border between A and B - border can be dragged

8. Drag border between B and C - border cannot be dragged

Execute steps: 3-8 without the tmux. The difference is that border between B and C is now draggable

Any ideas?

[Nicholas Marriott]

Aren't you meant to use ttymouse=sgr or something? Best ask the vim folks.

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[Carbolymer]

That's exactly the issue! Thanks! 

https://stackoverflow.com/q/7000960/1608594

Running vim in tmux somehow sets ttymouse=xterm, which causes this problem with columns>220.