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UIA in conhost: issues with visible ranges #7570

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opened 2026-01-31 01:07:31 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 01:07:31 +00:00
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Originally created by @codeofdusk on GitHub (Apr 23, 2020).

Originally assigned to: @carlos-zamora on GitHub.

Environment

Windows build number: [run `[Environment]::OSVersion` for powershell, or `ver` for cmd] next (19613.1000).
Windows Terminal version (if applicable): Inbox console

Any other software? NVDA

Steps to reproduce

  1. Download this list of domains.

  2. Start Windows Console and NVDA (with UIA in Windows Console enabled in advanced preferences).

  3. Run a python interpreter: python.

  4. Run:

    fin=open("domains.txt")
    fin.readlines()

Expected behaviour

Like in pre-21H1 conhost and Windows Terminal 0.11, NVDA reads current output immediately.

Actual behaviour

At this point, NVDA's auto-read lags far behind the actual output in the buffer. Quitting Python with quit() continues reading very old output.

Context

When a text change event is received, NVDA takes a diff of the old and new text and reads only the changed portion of the text. Maybe there's a bug in our diffing algorithm (implemented here, in LiveText._calculateNewText)?

Originally created by @codeofdusk on GitHub (Apr 23, 2020). Originally assigned to: @carlos-zamora on GitHub. <!-- 🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨 I ACKNOWLEDGE THE FOLLOWING BEFORE PROCEEDING: 1. If I delete this entire template and go my own path, the core team may close my issue without further explanation or engagement. 2. If I list multiple bugs/concerns in this one issue, the core team may close my issue without further explanation or engagement. 3. If I write an issue that has many duplicates, the core team may close my issue without further explanation or engagement (and without necessarily spending time to find the exact duplicate ID number). 4. If I leave the title incomplete when filing the issue, the core team may close my issue without further explanation or engagement. 5. If I file something completely blank in the body, the core team may close my issue without further explanation or engagement. All good? Then proceed! --> <!-- This bug tracker is monitored by Windows Terminal development team and other technical folks. **Important: When reporting BSODs or security issues, DO NOT attach memory dumps, logs, or traces to Github issues**. Instead, send dumps/traces to secure@microsoft.com, referencing this GitHub issue. If this is an application crash, please also provide a Feedback Hub submission link so we can find your diagnostic data on the backend. Use the category "Apps > Windows Terminal (Preview)" and choose "Share My Feedback" after submission to get the link. Please use this form and describe your issue, concisely but precisely, with as much detail as possible. --> # Environment ```none Windows build number: [run `[Environment]::OSVersion` for powershell, or `ver` for cmd] next (19613.1000). Windows Terminal version (if applicable): Inbox console Any other software? NVDA ``` # Steps to reproduce <!-- A description of how to trigger this bug. --> 1. Download [this list of domains](https://github.com/microsoft/terminal/files/4519753/domains.txt). 2. Start Windows Console and NVDA (with UIA in Windows Console enabled in advanced preferences). 3. Run a python interpreter: `python`. 4. Run: fin=open("domains.txt") fin.readlines() # Expected behaviour <!-- What's actually happening? --> Like in pre-21H1 conhost and Windows Terminal 0.11, NVDA reads current output immediately. # Actual behaviour <!-- A description of what you're expecting, possibly containing screenshots or reference material. --> At this point, NVDA's auto-read lags far behind the actual output in the buffer. Quitting Python with `quit()` continues reading very old output. # Context When a text change event is received, NVDA takes a diff of the old and new text and reads only the changed portion of the text. Maybe there's a bug in our diffing algorithm (implemented [here](https://github.com/nvaccess/nvda/blob/master/source/NVDAObjects/behaviors.py), in `LiveText._calculateNewText`)?
claunia added the Product-ConhostIssue-BugNeeds-Tag-FixArea-Accessibility labels 2026-01-31 01:07:31 +00:00
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Reference: starred/terminal#7570
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