Middle-mouse-to-paste does not work in lazygit

[matejcik]

Describe the bug
When mouse integration is enabled (the default), the X feature "middle-click to paste primary selection" does not work anymore.

To Reproduce

1. select a piece of text in your browser, e.g., this line
2. in lazygit, open a commit editor
3. try to paste the selected text by clicking middle mouse button on the commit editor box

Expected: text is pasted into the editor
Actual: nothing happens

Version info:
commit=145fb6191c108f7e7af8180106b82f0503a7994c, build date=2024-04-12T06:37:30Z, build source=unknown, version=145fb619, os=linux, arch=amd64, git version=2.43.2