BobLd

In certain conditions (tbd), the left panel cannot be extended anymore. In one occurrence it happened after navigating document through bookmarks

Introduce StackDepthGuard class to check for stack depth in CoreTokenScanner and fix #1217

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I'm not a huge fan of having to introduce a new class in order to track stack depth, but without an in-depth refactoring of `CoreTokenScanner`, this is needed to fix...