[PATCH] gdi32/tests: Add tests for zero-width control characters.

[Nikolay Sivov]

On 12/14/20 5:53 PM, Sven Baars wrote:
> Signed-off-by: Sven Baars <sbaars at codeweavers.com>
> ---
> Some tests with zero-width control characters for inconsistent behavior
> that I observed while trying to fix the ID3DXFont implementation. In our
> implementation these functions all use the same internal function, but on
> Windows none of them seem to do exactly the same.

Have you tried with different fonts? Especially with fonts not shipped
with Windows.

As I remember certain system fonts were updated in Windows 10 to have
empty glyphs for control characters. So what you see and this whole test
might be unnecessary tailored for Tahoma (including broken parts
reflecting font changes across windows releases).

Easy way to test is to use some modified Noto font to see when metrics
are used and when metrics are ignored for certain characters.