Sync vertical frame text with Project Properties

Your idea

Add a "Sync" checkbox next to each field in the Project Properties dialog that has a corresponding VBox text element (see mockup below). When enabled, changes to the project property update the VBox text, and editing the VBox text updates the project property.

Fields that would have a Sync checkbox:

Behavior:

• Sync ON + edit in Project Properties: the VBox text updates to match
• Sync ON + edit VBox text in the score: the project property updates to match
• Sync OFF: current behavior, both are independent
• Default for new scores: Sync ON for fields populated by the New Score wizard
• Existing scores: Sync OFF (backward compatible)
• Multiple elements: since the VBox can contain multiple elements of the same type (e.g. two TITLE texts), sync applies to the first element of that type

Problem to be solved

VBox text elements (Title, Subtitle, Composer, Lyricist) and project properties (workTitle, subtitle, composer, lyricist) are populated together only at score creation time. After that they are completely independent: editing the title in the VBox does not update Project Properties, and changing Project Properties does not update the VBox text. Users must update both locations manually, which is confusing and error prone.

Headers/footers already solve this by referencing metaTags via $:workTitle: tokens. The title frame needs a similar mechanism, with the added complexity of supporting in-place editing.

Prior art

Forum discussions:

• Keep in sync the Title text with the workTitle property
• Editing title and composer fields (users report having to update both locations manually)
• How to retrieve the text frame containing a piece's title

Related GitHub issues:

• #17007: Updating score properties via dialog does not update the score in the WYSIWYG editor (labeled as regression from MS3)
• #28144: Include score metadata (title, composer, copyright) as PDF metadata on export (metadata out of sync causes wrong PDF metadata)
• #33047: Plugin API: add getText() to read VBox title frame text (plugin side of this problem)

Additional context

This approach preserves backward compatibility (existing scores keep independent text), reuses the metaTag system as single source of truth, and gives users explicit control over which fields are linked.