Fix: Post title caret position issue

[Kallyan01]

What?

See: #64724

Why?

Previously we were not maintaining any caret position history stacks so predicting caret positions on undo/redo was not possible .

How?

• Used a history array which records the caret positions on different onChange events .
• Captured different key strokes to listen to undo and redo events .

Testing Instructions

Testing Instructions for Keyboard

• Add a new post or page.
• Select the Title block and enter a title.
• Paste additional text into the end of the field.
• Undo the paste with Cmd+z/Ctrl+z (using the editor toolbar Undo button changes focus from the field, so is n/a).
• Observe the location of the caret after undo ( | caret is moved to start of the deleted text).
• Without clicking or repositioning the caret, re-paste into the field with Cmd+v/Ctrl+v.
• Observe where the pasted text is inserted ( | text is inserted at end of field with updated caret position ).

Screenshots or screencast

Before

Screen.Recording.2024-12-16.at.4.22.47.PM.mov

After

Screen.Recording.2024-12-16.at.4.16.45.PM.mov

[github-actions]

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[Mamaduka]

Posted a general comment in the issue - #64724 (comment); let's continue the discussion there.

@Kallyan01, the trunk on your fork seems a bit out of sync. Do you mind rebasing this atop the lastest trunk from "upstream"?

[Mamaduka]

Thanks for contributing, @Kallyan01!

Closing this based on the general discussion in the issue. The selection needs to be tracked by the global and not the local state. I've some ideas on how to implement it and will try to create a PR when I've some time.