In many places we check whether VE is available before doing things
(init.isVisualAvailable). This variable includes checks for whether
the page is wikitext, etc. Now it will also include checking whether
VE is enabled in user preferences.
In almost all places where init.isVisualAvailable is used, we were
already also checking if VE is enabled, so this doesn't affect the
behavior. But notably, we didn't do it when showing the option to
switch to VE in the welcome dialog and in the toolbar, causing T243723.
Changing init.isVisualAvailable this way makes it consistent with
init.isWikitextAvailable, which has always included a checking whether
NWE is enabled in user preferences.
Bug: T243723
Change-Id: Ie174bc3f16bceb29cb155b9223e0acef70167fd6
Previously, the ve-mw/init/ directory contained two kinds of files:
those that were used when initializing VE, and those that may be
loaded even if VE is not going to be initialized at all. The latter
kind must not use the `ve` global variable.
After moving those files to ve-mw/preinit/ we can enforce this with
.eslintrc.json in that directory. This would have prevented T228684.
(Technically they merely must not use `ve.init`, and may use `ve`,
but that's harder to enforce. We should instead move the few non-init
methods out of `ve`: now, track, trackSubscribe, trackSubscribeAll).
Also, group some files under ve-mw/init/: targets/ now (only)
contains ve.init.mw.Target and its subclasses, apiresponsecache/
now contains ve.init.mw.ApiResponseCache and its subclasses.
Bug: T228684
Change-Id: I945249a27f6a0fa10a432d5c5dc57bc7e0461fd8
