Hey @najohnsn, does this mean I can select text now (when this is merged)?
Asking because in Windows Terminal, I can select with shift + mouse-clicked drag.
In macOS Terminal, I can't select text at all.

No. This PR had nothing to do with selecting text. A "selector pen" (or a "light pen") is a piece of old 3270 terminal technology that looked like a pen and you touched to the screen. 3270 applications could define fields that interacted with this pen touch. This PR uses a mouse click to emulate this interaction.

The ability to select text will depend on your terminal emulator in which zti is running. I now have macOS and have had mixed success with selecting text - depending on the terminal emulator. Usually holding down some key (like Shift, Ctrl, or Cmd... or a combination) while using the mouse to select text will work. The terminal emulator should document the details.

Sometimes I press Esc to go to the zti prompt, enter "display", and select text from there - it sometimes works better when zti isn't capturing mouse clicks itself.