tmux on Windows doesn't respond to mouse events in terminal

[AlteredConstants]

• VSCode Version: Code - Insiders 1.14.0-insider (63def6e, 2017-06-28T05:16:57.588Z)
• OS Version: Windows_NT ia32 10.0.16226
• Extensions:

Extension	Author (truncated)	Version
vscode-eslint	dba	1.2.11
EditorConfig	Edi	0.9.3
prettier-vscode	esb	0.20.0
macros	ged	1.2.0
vscode-settings-cycler	hoo	1.0.1
debugger-for-chrome	msj	3.1.6
shell-launcher	Tyr	0.1.1

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Steps to Reproduce:

1. Configure VSCode terminal to use a WSL Bash shell on Windows. ("terminal.integrated.shell.windows": "C:\\WINDOWS\\sysnative\\bash.exe")
2. Open a terminal and run tmux (with set -g mouse on in ~/.tmux.conf).
3. Output enough text to the terminal to overflow the window.
4. Attempt to scroll with the mouse.
5. Open a new panel (Ctrl+B, %).
6. Attempt to resize the panels with the mouse.
7. Attempt to focus each panel by clicking within one and then the other with the mouse.

Reproduces without extensions: Yes

Steps 4, 6, and 7 all fail but do work in the normal "Bash on Ubuntu on Windows" terminal outside of VSCode. This is also a problem in 1.13.1. I'd hoped #9958 would fix the problem, but it didn't. (Assuming it made it into the insider build for today?)

[AlteredConstants]

Also, before launching tmux, if the regular Bash session has sufficient output to overflow the window, you can scroll. Once you launch tmux, scrolling will show the original shell's scroll buffer (instead of tmux's).

[Tyriar]

Verified this is still happening. I'm guessing winpty doesn't know to pass through mouse events to the shell

[Tyriar]

This is likely related to winpty, tracking in #45693