D8652: Add supported transformations to OutputDevice

[Martin Flöser]

graesslin added inline comments.

INLINE COMMENTS

> davidedmundson wrote in outputdevice_interface.cpp:470
> we have the initial send which is all fine
> 
> Then you've got this dynamically add them.
> But at a protocol level we have no way to remove and replace.
> That's somewhat broken.
> 
> Personally, I'd just make it a static and document that it must be sent before the first done()

I'm not 100 % sure whether we can in KWin determine the supported rotations in all cases before the OutputDeviceInterface is fully setup. Thus I wanted to have a little bit of flexibility here.

Also if we need it we can add a remove. If we go for a static approach, we cannot remove again.

REPOSITORY
  R127 KWayland

REVISION DETAIL
  https://phabricator.kde.org/D8652

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