[Libreoffice-ux-advise] [Bug 156789] CALC FORMATTING: Cell background color not rendered when OS high contrast display mode is on

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=156789

Caolán McNamara <caolan.mcnamara at collabora.com> changed:

           What    |Removed                     |Added
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                 CC|                            |m.weghorn at posteo.de

--- Comment #16 from Caolán McNamara <caolan.mcnamara at collabora.com> ---
Yeah, this is apparently by design. Maybe following the "letter of the law" for
some compliance effort in the past, I find the outcome quite odd but there is
quite a lot of built-in code that works hard to provide this result for high
contrast accessibility. IIRC when I enable a similar setting in e.g. MSOffice I
get fairly bizarro-land results too. I tried to cover what I know in slide 7 of
https://fosdem.org/2023/schedule/event/lotech_darkmodes/ which I'll paste here:

<<
Accessibility High Contrast Mode

May not be a dark mode, but often is, but this is a special mode. We make a
special effort to follow these rules, with arguably strange results:

 * learn.microsoft.com/en-us/windows/win32/winauto/high-contrast-parameter
“Map all colors to a single pair of foreground and background colors. Use the
GetSysColor function to determine the appropriate foreground and background
colors, using either a combination of COLOR_WINDOWTEXT and COLOR_WINDOW or a
combination of COLOR_BTNTEXT and COLOR_BTNFACE. The GetSysColor function
returns the colors selected by the user through the Control Panel.
 * Omit any bitmapped images that would typically be displayed behind text.
Such images are visually distracting to a user who needs high contrast.
Images that would typically be drawn in multiple colors should be drawn using
the foreground and background colors selected for text.”
>>

I don't know if Michael W. has any specific insight into if we're doing this
right at all, but I think this old a11y recommendation is why we end up like
this.

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