[Fix] block dragging errors between editors with multiple column extension

[Hector-Zhuang]

This PR fixes an error that occurs when dragging a block from one editor to another while using the multiple column extension.

How Has This Been Tested?

• Dragging blocks within editor configured with multiple column extension
• Dragging blocks from one editor to another

Video

Screen.Recording.2025-08-19.at.5.55.49.PM.mov

Root Cause

When a block is dragged from an editor, its ID is regenerated. After the block is dropped, the target editor attempts to delete a block with the same ID. However, since that ID does not exist in the target editor, this leads to an error.

FIx

The fix ensures that the target editor checks whether the block exists before attempting to delete it.

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commit: b43c88f

[Hector-Zhuang]

Also, there's a miscalculation of the cursor position, as you can see in the video—the cursor should only appear in a single editor

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Project	Deployment	Preview	Updated (UTC)
blocknote	Error		Aug 22, 2025 0:59am

[nperez0111]

Thanks @Hector-Zhuang, this looks great. Thanks for your detailed description of the problem