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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
Why an application and not the UI framework has to care for dark mode?
LibreOffice uses its own widget toolkit. It works similarly to wxWidgets, basically just maps to whatever toolkit is native on the current platform. It uses Win32 on Windows, Cocoa on macOS, Qt on KDE, GTK on GNOME and a few others.
That said, their current approach to dark themes is pretty bad. It can very easily conflict with the dark theme from the host toolkit and cause issues if misconfigured, which has caused a lot of people to think it just doesn't work. It does work, but it can be confusing as hell to configure correctly.
For instance, LibreOffice has a setting you can use to change the application colors. It barely works and you should never touch it. Just let it get the colors from your toolkit.
There's also the fact that LibreOffice doesn't use FDO icons and has its own icon setting which doesn't automatically follow dark/light theme. If you're using a dark theme, you have to manually switch the icon set to one that isn't impossible to see on a dark background.
Oh and if you want your documents to use a dark palette that's also a separate setting. Like I said, confusing.
Thanks for the view behind the curtains!
And yeah, dark in the document is another pain point, especially in IDE's/editors and if you switch between dark and light for day/night. They should just all have color/icon settings for dark/light separately.
What is FDO icons?
FDO stands for FreeDesktop.Org, the committee responsible for various desktop Linux standards including icon themes. So FDO icons just refers to your system icon theme, which LibreOffice doesn't use.
What's the difference between libre and only?
Which one is "better"
OnlyOffice is Web only. Their desktop app runs on Electron (or Erge webview on Windows I guess... Linux needs a webview)
That's OpenOffice Apache that got deprecated.
I was aksimg about onlyoffice which I think is offshoot from libre