https://bugs.kde.org/show_bug.cgi?id=360457

--- Comment #12 from Martin Gräßlin <mgraess...@kde.org> ---
> So, could you please elaborate what you mean with "not based on a
> scaled down
> thumbnail"? Because https://community.kde.org/KWin/Window_Metadata
> does not
> explain it.

Quoting our documentation: "When a thumbnail is required the window 
manager informs the application for which window and in which size a 
thumbnail is needed. In addition it passes a filedescriptor of a pipe to 
the application. The application renders the thumbnail and writes the 
rendering result into the pipe and closes the pipe once the rendering is 
finished."

Which means: the application renders the thumbnail in the requested 
size. What that is: completely depends on application. E.g. a browser 
could just render a fav icon of open tab and the title. A contact 
application could render information about the selcted contact. A mail 
application could render a readable preview of the open mail. The 
important part is: the application is in control and it's not going to 
be scaled down. Readability is at the core.

We are giving the thumbnail back to the application.

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