Feature request: GPM support on text consoles

[rsmirnov90]

When trying to select text using a mouse in a graphical terminal (i.e. Kitty), it works perfectly as expected and the selection stays confined within its own pane.

However, when trying to use the old-school GPM driver (for the text console), it doesn't have that feature. It simply highlights the entire line across panes.

I am not sure if this is even possible or feasible to add (as I am not sure if GPM actually interacts with the underlying app the way the text mouse did with DOS apps, or if it is just an overlay on top of the console strictly for selecting text). Still, just figured I would put it out there as I am sure there are people who know much more about this than I do.

[digitalsignalperson]

I found this issue searching around for console multiplexer things with GPM support

Findings:

• zellij - no (according to this issue)
• vtm - has mouse but doesn't use GPM; requires privileged access to /dev/input/mice Linux console and gpm directvt/vtm#125
• twin term - yes and GPM is a dependency. Bonus tip that you can trick some apps into using the mouse with export TERM=xterm GPM support in Twin Term  cosmos72/twin#89

so at least there's a POC that it can be done