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Prevent deadlock in UIA Move API (#10937)
Fixes a bug where interacting with Windows Terminal when using Narrator causes Windows Terminal to hang. `UiaTextRangeBase::Move()` locks, but later calls `UiaTextRangeBase::ExpandToEnclosingUnit()` which attempts to lock again. The workaround for this is to introduce a `_expandToEnclosingUnit()` that _does not_ lock the console. Then, `Move()` calls this new method, thus only allowing one lock to be established at a time. This bug is observed to be in v1.11.2221.0 and _not_ in v1.9.1942.0.
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