https://bugs.kde.org/show_bug.cgi?id=498446

fanzhuyi...@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unspecified                 |git master
            Summary|in breeze/oxygen style,     |GL_INVALID_VALUE in
                   |show keyboard accelerator   |glTexSubImage2D under
                   |when alt is pressed option  |fractional scaling,
                   |not working                 |breaking "show keyboard
                   |                            |accelerator when alt is
                   |                            |pressed" in window menu

--- Comment #8 from fanzhuyi...@gmail.com ---
The underlying issue seems to be rounding errors under fractional scaling. The
evidence includes:

- The issue doesn't occur when all displays are set to 100% scaling
- When display is set to fractional scaling (on my end 135%) to trigger the
issue, I see lines such as
> kwin_scene_opengl: 0x2: GL_INVALID_VALUE in glTexSubImage2D(xoffset 0 + width 
> 507 > 506)
> kwin_scene_opengl: 0x3: GL_INVALID_VALUE in glTexSubImage2D(yoffset 0 + 
> height 947 > 946)
in the logs when I press/release alt, indicating a off-by-1 error in the size.
(only first line appears if no submenus are open, second line appears if a
certain submenu is open).

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