Wikimedia Bugzilla is closed!

Steps to reproduce bug:
1. Edit a page
2. Insert a transclusion, apply changes
# The transclusion is now selected (VE does this automatically for newly inserted nodes)
3. Type a characters
# Selected content is removed, text is inserted
4. Undo

The expected result is the text being replaced with the transclusion. Instead a pawn is inserted.

Upon further inspection I noticed that the transclusion isn't lost, however. In fact it is right there when you Undo again (after getting the pawn).

So it looks like the pawn was inserted as a transaction in the middle of removing the transclusion (its own transaction but not supposed to be?) and inserting the text.

We auto-select the template after insertion and it is relatively easy to accidentally press a key afterwards. And Undo then shows the user something scary (their template appears lost). A fairly high priority bug regarding user experience.

Not sure if this is a regression or not.