D5910: make shadows work on wayland

[Marco Martin]

mart added inline comments.

INLINE COMMENTS

> davidedmundson wrote in breezeshadowhelper.cpp:177
> we use Expose everywhere else, why not here? It gets called a lot less

it's a qwidget, doesn't get expose events

> davidedmundson wrote in breezeshadowhelper.cpp:464
> this is currently leaking?
> 
> fromWindow constructs a new QObject

it should index those by widget as well i guess, then using this to keep track as opposed to repurposing the _widgets map

REPOSITORY
  R31 Breeze

REVISION DETAIL
  https://phabricator.kde.org/D5910

To: mart, #plasma, hpereiradacosta
Cc: anthonyfieroni, davidedmundson, plasma-devel, ZrenBot, spstarr, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, lukas
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