Option to separately (de)select {audio-context} about memento

[ripose-jp]

Why wouldn't you just use {audio-media} instead if the selected context is too long?

I don't really want to make adding cards any harder than it already is. Adding more UI elements to the Subtitle List seems like it'd only make it more confusing, especially for something niche like wanting audio from more than one subtitle but text from a different set of subtitles.

[Calvin-Xu]

I see. {audio-context} is awesome in 99% of the cases, but sometimes finer control is great.

As an alternative, would you consider a feature where the user can copy the text of (multiple) selected lines in the subtitle list? If it's mapped to a keybind like Ctrl-C there would be no additional UI elements. Currently double clicking on the SubtitleWidget copies that line.

[ripose-jp]

I've implemented Ctrl+C as a shortcut to copy the currently selected context. It's up on master.