Hidden lines become visible in scores imported from v1.x

Same issue for instrument name and bracket.
But not for title, clef, time sig, keysig, note head, stem, accidental, bar line

applies to 1.3 scores too. Tested on Windows 7 with 1.3 and the same commit as heuchi, self build

Looks like in 1.x the visible property of a hairpin is recorded in it's Segment, in 2.0 it is recorded there and in the hairpin directly

1.x:
{syntaxhighlighter brush:xml;highlight:[8]}

1920

0

{/syntaxhighlighter}

2.0:
{syntaxhighlighter brush:xml;highlight:[4,9]}

0
10
0

0

0

{/syntaxhighlighter}

On import and subsequent save neither is written

Instrument name and bracket can get marked invisble in 2.0, but this doesn't get saved, so is lost on next load.
So this is an entirely different issue, I'll file it separately, see #33541: some elements can get marked invisible, but this doesn't get saved, so is lost on reload

Proposed PR:
https://github.com/musescore/MuseScore/pull/1348
The new bits of code I inserted in this PR are used only when loading a 1.x file.

Fixed in eec14add4d

Automatically closed -- issue fixed for 2 weeks with no activity.