7a1932c556
`ScrollIntoView` is responsible for scrolling the viewport to include the UTR's start endpoint. The crash was caused by `start` being at the exclusive end, and attempting to scroll to it. This is now fixed by clamping the result to the bottom of the buffer. Most of the work here is to allow a test for this. `ScrollIntoView` relied on a virtual `ChangeViewport` function. By making that non-virtual, the `DummyElementProvider` in the tests can now be a `ScreenInfoUiaProviderBase`. This opens up the possibility of more UiaTextRange tests in the future too. Closes #7839 |
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