Braille Viewer: Sometimes Displays Incorrect Patterns

[HegrJan]

The on-screen braille viewer in NVDA sometimes does not show the correct braille pattern, even when the real braille display shows the correct pattern. Specifically, braille characters in Czech 8-dot computer braille seem to be incorrectly rendered on the screen.
Examples of the issue:
• Character "Ť" (U+0164) is displayed as "12567" on the physical display but appears as "1267" in the on-screen viewer.
• Character "Ź" (U+0179) is displayed as "3478" on the physical display but appears as "23478" in the on-screen viewer.

Steps to reproduce:

1. Set NVDA’s Braille settings to "Czech 8 dot computer braille."
2. Compare the braille displayed on the physical braille display and the on-screen braille viewer.

System configuration

NVDA installed/portable/running from source:

Installed

NVDA version:

2024.4.1

Windows version:

Windows 11 24H2 (build 26100.3194), Czech version

Name and version of other software in use when reproducing the issue:

General issue

Other information about your system:

NVDA Braille Settings - Output table: Czech 8 dot computer braille

Other questions

Does the issue still occur after restarting your computer?

Yes

Have you tried any other versions of NVDA? If so, please report their behaviors.

No

If NVDA add-ons are disabled, is your problem still occurring?

Yes

Does the issue still occur after you run the COM Registration Fixing Tool in NVDA's tools menu?

Yes