[Libreoffice-bugs] [Bug 138122] LibreOffice font blurry on MacBook Pro's Internal HiDPI Retina Display running macOS Big Sur 11.0.1

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=138122

--- Comment #15 from Emmeran Seehuber <rototor at rototor.de> ---
Please be so kind and don't add future "me too" comments. This bug (which is
exact the same as bug 122218) is confirmed. It affects all macOS 11 Big Sur
users with Retina screens. 

I try to recap what we know about this problem:

- It is only visible on Retina screens. It's not important if this screen is
built-in or external. The fonts get blurry.
- The print preview in Calc is fine, i.e. it is *not* blurry - for what ever
reason.
- macOS 10.14 added some breaking changes, which caused this bug. What this
changes were exactly - no idea.
- macOS 10.14 also added some "legacy compatibility mode". If an application
was build or at least pretends to be build with the SDK for macOS 10.13 or
earlier, it would "revert" this breaking changes for that application. The
workaround in bug 122218 made LibreOffice look like an old macOS 10.13
application. So it fixed this bug "for now".
- macOS 11 dropped this "legacy compatibility mode". So you have to adapt to
the new way of doing things, or you get blurry text.

The problem is that we do not know what should be changed in LibreOffice, or
what exactly the legacy stuff is LibreOffice is using, which was changed in
macOS 10.14. Maybe it has something to do with the "Layer-Backed Views"
described in the macOS 10.14 Release Notes 

https://developer.apple.com/documentation/macos_release_notes/macos_mojave_10_14_release_notes/appkit_release_notes_for_macos_10_14

Or maybe it's something completely different.

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