When a css value has "child" css values (e.g. a linear gradient has
several color stop css values) which are all computed (won't change when
compute() is called on them), we want to skip computing the entire
subtree.
Since css values are immutable, we can set the is_computed flag at
construct time.
Since GtkCssValue instances are 0-initialized in _gtk_css_value_alloc,
the default for is_computed it FALSE. This commit only sets it to TRUE
in a few cases, such as various "none" singleton values which will never
change. Later commits will refine this and set it for more values.
This is just lots of renaming.
The interface remains private, so the public API does not change, apart
from removing the definition of the Interface object to avoid
subclassing.
The property is useless to set (it only allows 'initial', 'inherit' and
'unset' as values), but it is used to track changes to the icon theme.
And as such, it can ensure that widgets can track when they need to
reload icons.
https://bugzilla.gnome.org/show_bug.cgi?id=743341
