ES6 finally adds standard class syntax to the language, so we can
replace our custom Lang.Class framework with the new syntax. Any
classes that inherit from GObject will need special treatment,
so limit the port to regular javascript classes for now.
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/361
Any symbols (including class properties) that should be visible
outside the module it's defined in need to be defined as global.
For now gjs still allows the access for 'const', but get rid of
the warnings spill now by changing it.
https://bugzilla.gnome.org/show_bug.cgi?id=785084
The only point of using a custom container here was to prevent StBoxLayout
from enforcing the wrong request mode based on the orientation. With that
issue fixed, we can simplify the checkbox widget significantly.
https://bugzilla.gnome.org/show_bug.cgi?id=703811
StBoxLayout currently does not handle height-for-width children
correctly under some circumstances. As a work-around, hard-code
a label height of two lines of text, which should work for most
locales in the one place the widget is currently used.
https://bugzilla.gnome.org/show_bug.cgi?id=672543
