Folded regions should keep folded when being moved (e.g. via `swap_line_up` and `swap_line_down`)

[deathaxe]

Problem description

Selecting a line which contains a folded region and moving it up or down via swap_line_up or swap_line_down unfolds the folded code block.

It is a surprising behaviour and might result in loosing track of content if unfolded region expands to several dozens or hundreds of lines.

Preferred solution

Treat folded regions as part of current line and move them together with the whole line without unfolding them or changing selection.

Alternatives

?

Additional Information

No response

[deathaxe]

Note: Folding state should also be maintained for normal copy & paste operations (see https://github.com/sublimehq/sublime_text/issues/494).