Fix #24742: Lost cursor style when moving to next syllable, verse, etc.

[mathesoncalum]

Resolves: #24742

The underlying problem here is that we're calling TextCursor::set when we really shouldn't. This method is used to set the cursor based on a point (set by the mouse) which we don't have when we're adding lyrics with the keyboard. This initially became a problem with #22209 (after this we call updateCursorFormat every time set is called), and the problem evolved with #23627 (changes to font metrics caused an early return inside set, leading to a resetFormatting call).

The first part of this fix is a change to bindCursorPosToText as this was spitting out garbage values when cursorPos was null. After this we can check whether startMove is null and avoid unwanted calls to TextCursor::set.

After making these changes everything is fine for syllables, melisma, etc. - but I discovered that verses were still broken. This is for an entirely different reason - these were broken in #23868 when some setIsEven calls were removed. The problem here is that styleDidChange will evaluate to true in LyricsLayout::layout due to a mismatch between isEven and the TextStyleType.

[mike-spa]

Looks good, thank you!

[zacjansheski]

Tested on MacOS 14, Windows 11, Ubuntu 22.04.3. Approved
#24742 FIXED