Traditionally, getter/setter functions have been considered a
C convenience, and we therefore didn't bother to add them for
many properties that are only consumed from JS.
However now that gjs optimizes property accesses by calling the
appropriate getter/setter instead, it makes sense to add them.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3620>
This layout manager is used quite often and the time we spend calling
it's allocate and get_preferred_width/heigth functions increases with
every open window.
We can save a lot of precious time during the layout cycle by moving
this layout manager from JS to C, thus avoiding the overhead of
trampolining between C and JS land.
In a measurement where the average time spent in vfunc_allocate() of the
Workspace actor was measured while opening an overview with 20 windows,
the average time spent went down from 3.1 ms to 2.3 ms.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1743>
