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Fire UIA Events for Output and Cursor Movement (#4826)
## Summary of the Pull Request This notifies automation clients (i.e.: NVDA, narrator, etc...) of new output being rendered to the screen. ## References Close #2447 - Signaling for new output and cursor Close #3791 - fixed by signaling cursor changes ## Detailed Description of the Pull Request / Additional comments - Added tracing for UiaRenderer. This makes it easier to debug issues with notifying an automation client. - Fire TextChanged automation events when new content is output to the screen. ## Validation Steps Performed Verified with NVDA [1] ## Narrator Narrator works _better_, but is unable to detect new output consistently. There is no harm for narrator when this change goes in. [1] #2447 (comment)
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