[TxMt] hang (sort of) when we right-arrow over a right-curly-brace

[Matt Neuburg]

If I'm repeatedly typing right-arrow to move the cursor position to the right, and the character I pass over happens to be a right-curly-brace that isn't balanced by a nearby left-curly-brace, TM seems to hang. It does recover, but it scares the pants off me every time it happens. m.

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