D8050: Expose wl_display_set_global_filter as a virtual method

[David Edmundson]

davidedmundson added inline comments.

INLINE COMMENTS

> graesslin wrote in filtered_display.cpp:62
> I didn't know such API exists! This is great ;-)
> 
> But I think you need to increase the minimum Wayland version.

Somewhat. 
This is new in 1.13, we depend on 1.7.

Debian is currently on 1.12.
(my general rule is: "is Debian has it, everyone else must do")

Should we #ifdefs and then no-op (with a qwarning) on older libwayland?

REPOSITORY
  R127 KWayland

REVISION DETAIL
  https://phabricator.kde.org/D8050

To: davidedmundson, #plasma
Cc: graesslin, plasma-devel, #frameworks, leezu, ZrenBot, alexeymin, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, eliasp, sebas, apol, mart, hein
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