[rexical-react] Bug Fix: Headings inside collapsible sections are lost when Table of Contents is re-initialized #6371
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Description
This pr changes the logic in TableOfContentsPlugin initialization. Previously only the headings on the highest level were added to the Table of Contents. Now the tree traversal is executed, so that the headings on all level are processed correctly, including headings inside Collapsible Sections and Tables.
Test plan
Before
The headings inside Collapsible sections disappear when ToC switched is toggled on and off.
After
The Table of Contents stays the same when ToC switched is toggled on and off.