Enable scroll locking on the terminal

[foot]

Fixes #1481

[foot]

@2opremio could you give this a quick test please!

[2opremio]

Sure, I'll do that before EOD.

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@2opremio https://github.com/2opremio could you give this a quick test
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[davkal]

If I run the following and try to scroll up, the screen goes all black (before the fix it would jump around but show output.

while true; do find /etc; done                                

[foot]

Good one, that blows through the scroll back nice and quickly..

[2opremio]

I am missing a side bar to indicate where am I in the history.

[2opremio]

Also, I would expect scrolling to happen when selecting text and moving the mouse up. That is:

[foot]

Scrollbars are a nice to have, mentioned in #1940.

Scrolling up as we drag up is an interesting one. I'll mention it in that issue too.

[foot]

But you're looking for a way to export the contents of the terminal somehow. Other (less ideal but still) options:

• Copy terminal contents to clipboard
• Show terminal contents in some other mode that allows for better selection. (textarea/plain <p>s)

[foot]

Issue w/ this: cannot make a selection after having scrolled up.

[davkal]

Scrolling up works well, and the position stays there. Selections dont work when scrolled up, but that's mentioned. Definitely an improvement. LGTM

[2opremio]

Selections dont work when scrolled up, but that's mentioned

Is there an issue for this?