Emoji cause crash when used in QML Text, unless using NativeRendering (emoji's are then invisible)

I received a report from Antergos users with Qt 5.8 that my widget was causing plasmashell to crash when trying to load text with emoji's in them.

https://github.com/Zren/plasma-applets/issues/60

I was using `Text

{ text: "\ud83e\udd11" }

`

But as soon as I changed to using PlasmaComponents.Label, which is basically:

`Text

{ text: "\ud83e\udd11"; renderType: Text.NativeRendering }

`

the emojis no longer crashed plasmashell. However, the emojis were invisible. As in, they took up space, but no "glyph" was drawn.

Emoji's show up fine in KDE Neon with Qt 5.7.1