Summary of the new feature/enhancement

You can take a screenshot of whole window with Alt+Prt Scr, but it would be handy if one could do so only on selected text.
With box selection this would contain selected area, whereas with regular selection it would contain every selected line.

In profile settings one could be able to choose whether the background of taken screenshot should be the actual displayed background or something else (probably solid color). This would ease making tutorials or reports, when one doesn't want to show what's behind the terminal.
Other option could be additional marigin, as so the first pixel of text isn't the first pixel of image.

I'm not sure about appropriate shortcut, meaby some Func+Prt Scr?

Proposed technical implementation details (optional)

I can see this being solved either by taking regular screen shot or re-rendering selected text to buffer. Idk which option's better, but with custom background it seem's like the second one.