Outline does not remember state between restarts

[dandv]

@dandv

On Linux, folded state in the outline is reliably forgotten simply by deleting a paragraph in Source mode.

Reported this separately at Outline tab does not stay collapsed and scrolls while typing (expands, unfolds headings) - #25 by dandv

@dandv

I’ve also seen mismatched folding states in Source mode - the heading showing as folded (> and the ... at the end), but the text within expanded.

@CawlinTeffid I’ll file a separate report when I encounter this reliably again.