Unable to edit target platform source file if text starts with <

[laeubi]

Typing some text that starts with < or even pasting some (incomplete) text-fragments make the source editor going completely wild and at best deleting the inserted text, at worst it delete some other content as well, see video.

Peek.2025-02-14.10-27.mp4

@mickaelistria I'm not sure if it is a PDE issue, a Generic Editor issue or a lemminx issue (or feature?) or a combination of both but it makes the target editor hardly usable at the moment.

Eclipse SDK

Version: 2025-03 (4.35)
Build id: I20250210-1800

but I also noticed that in M2 release!

[laeubi]

If I start eclipse with the console I see:

Exception in thread "org.eclipse.pde.internal.genericeditor.target.extension.reconciler.folding.TargetPlatformFoldingReconciler" java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0
	at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:100)
	at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:106)
	at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:302)
	at java.base/java.util.Objects.checkIndex(Objects.java:385)
	at java.base/java.util.ArrayList.get(ArrayList.java:427)
	at org.eclipse.pde.internal.genericeditor.target.extension.reconciler.folding.FoldingReconcilerStrategy.getNewPositionsOfAnnotations(FoldingReconcilerStrategy.java:181)
	at org.eclipse.pde.internal.genericeditor.target.extension.reconciler.folding.FoldingReconcilerStrategy.initialReconcile(FoldingReconcilerStrategy.java:71)
	at org.eclipse.pde.internal.genericeditor.target.extension.reconciler.folding.FoldingReconcilerStrategy.reconcile(FoldingReconcilerStrategy.java:53)
	at org.eclipse.jface.text.reconciler.Reconciler.process(Reconciler.java:149)
	at org.eclipse.jface.text.reconciler.AbstractReconciler$BackgroundThread.run(AbstractReconciler.java:207)

[mickaelistria]

Can you make similar issue happen with with any XML file in the generic editor with Wild Web Developer installed?