Correctly Group Drag-and-drop for Undo

[thecoolwinter]

Description

Moves the endUndoGrouping call to the end of the actual editing operation when dropping text. Makes it so only one undo command is needed to undo a drag-and-drop operation.

Related Issues

• closes 🐞 Undo Drag and Drop Text Requires Two Steps Instead of One #99

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

Screenshots

Screen.Recording.2025-06-18.at.10.43.00.AM.mov