Set text style & properties position on migration from 4.6

[miiizen]

Resolves: #32395

Also fixes alignment reset buttons in properties.

[davidstephengrant]

@miiizen This is now working for defined text styles, but when text alignment is overridden (e.g. using the properties panel) the chosen alignment is not migrated correctly.

Example project file

[miiizen]

Updated with this fix. I've also fixed the reset & set as default buttons. These were ignoring the new horizontal position buttons.

[davidstephengrant]

In general this seems to be working well, but there are a few individual text styles that are not fully migrated. See here, where Repeat text right has been set to center-aligned in 4.6.5. When opening the score with this PR the text is correctly centered within its bounding box, but the text box is still right-aligned to reference point.

There is some special handling for certain text styles which got the new position property in 4.6 (including repeat text, chord symbols, ...), but in this case there is still a visible difference in the score when opening and file made in an older version.

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Text styles where I find there may still be an issue:

• Bar number (alternate)
• Repeat play count
• Repeat text left
• Repeat text right
• Rehearsal mark
• Chord symbol
• Chord symbol (alternate)
• Roman numeral analysis
• Nashville number

[davidstephengrant]

After discussing with @miiizen we're happy with this for now. Tested and approved on Ubuntu 24.04.4 LTS.