Pipe output to external tools
Make it possible to bind a key combo to pipe either all visible text, or the entire scrollback history, to an external tool.
This could for example be used to present a list of all currently visible URLs, and copy the by-user-selected URL to the clipboard, or open in a browser.
The "selection" handling code already reads out text from the grid. While not directly re-usable, it should be possible to generalize that code and use it both in the selection handling code, and to pipe the output.
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