fix: check if item belongs to the container before removing

[im-adithya]

Fixes #1480

Description

It is because onDropEnd function runs with the draggableInfo which has the same src as the one in the other gallery. And since src is the only identifier we use, I added a check if the draggableInfo.element belongs to the parent i.e. this gallery component before deleting (because we anyways run delete functions for the elements inside the component).

[coderabbitai]

Walkthrough

The pull request updates the onDropEnd function within the useGalleryReorder hook. It adds a validation step to verify that the container reference (containerRef) is defined and that it contains the draggable element. If the container reference is not present or the element is not found in the container, the function returns early, preventing any further drop processing. This change ensures that the drop action only proceeds when it occurs within the designated container and helps to avoid unintended updates in scenarios such as cross-gallery reordering. No changes were made to the declarations of exported or public entities.

Assessment against linked issues

Objective	Addressed	Explanation
Prevent cross-gallery interference during reorder operations (#1480)	✅

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packages/koenig-lexical/src/hooks/useGalleryReorder.js

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Reviewing files that changed from the base of the PR and between 1d4ecdd and ac1c787.

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• packages/koenig-lexical/src/hooks/useGalleryReorder.js (1 hunks)

🔇 Additional comments (1)

packages/koenig-lexical/src/hooks/useGalleryReorder.js (1)

86-88: Excellent addition to prevent unintended deletions!

This check correctly addresses the issue described in the PR by ensuring that the element being dropped actually belongs to the current gallery container before attempting to remove it. This prevents unintended deletions when dragging between different galleries, where draggableInfo.src might match between galleries.

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[im-adithya]

@9larsons can you please have a look :D