To avoid a few log lines on all platforms:
```
ffi.load: SDL2
ffi.load (warning): libSDL2.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so
ffi.load (warning): libSDL2-2.0.so: cannot open shared object file: No such file or directory
ffi.load: libSDL2-2.0.so.0
ffi.load (warning): libSDL2-2.0.so.0: cannot open shared object file: No such file or directory
```
We've managed to trip a few of those on dimen fields post-init but
pre-paintTo in a few weird coner-cases, a point at which dimen is often
nil.
ConfigDialog: Deal with that very thing in update()
Fix#7656
A dotted line joining the ToC entry text to the
page number may make it easier to use.
(This replaces the menu item separator from d879062e.)
Also fix baselines aligment, which could be a bit off.
* FileManager/ReaderUI: Clarify the current instance accessor
Make it clearer that we actually store it in a *module/class* member, not an *instance* member.
Also, warn if there's a close/open mismatch.
Use a table & table.concat instead of individual concats.
And then use that same table for every hash-related operation.
(Nothing else uses the configurable hash function, otherwise I'd have
limited the table shenanigans to the function itself).
* Allow doing away with CacheItem
Now that we have working FFI finalizers on BBs, it's mostly useless overhead.
We only keep it for DocCache, because it's slightly larger, and memory pressure might put us in a do or die situation where waiting for the GC might mean an OOM kill.
* Expose's LRU slot-only mode
And use it for CatalogCache, which doesn't care about storage space
* Make GlyphCache slots only (storage space is insignificant here, it was
always going to be evicted by running out of slots).
* More informative warning when we chop the cache in half
* Neuter timekeeping when statistics are disabled
Saves a few syscalls ;).
* Port to ffi/lru
Only a tiny bit of it actually requires any sort of LRU logic, so it's fairly painless.
* Release the cache on close
* Use string.buffer to serialize function arguments
Ought to be faster than the custom approach ;).
(Still requires wrapping them in a table, though).
It's much less human-readable, but then again, this doesn't need to be :).
Ought to be faster than our naive array-based approach.
Especially for the glyph cache, which has a solid amount of elements,
and is mostly cache hits.
(There are few things worse for performance in Lua than
table.remove @ !tail and table.insert @ !tail, which this was full of :/).
DocCache: New module that's now an actual Cache instance instead of a
weird hack. Replaces "Cache" (the instance) as used across Document &
co.
Only Cache instance with on-disk persistence.
ImageCache: Update to new Cache.
GlyphCache: Update to new Cache.
Also, actually free glyph bbs on eviction.
* Minor updates to the min & max cache sizes (16 & 64MB). Mostly to satisfy my power-of-two OCD.
* Purge broken on-disk cache files
* Optimize free RAM computations
* Start dropping LRU items when running low on memory before pre-rendring (hinting) pages in non-reflowable documents.
* Make serialize dump the most recently *displayed* page, as the actual MRU item is the most recently *hinted* page, not the current one.
* Use more accurate item size estimations across the whole codebase.
TileCacheItem:
* Drop lua-serialize in favor of Persist.
KoptInterface:
* Drop lua-serialize in favor of Persist.
* Make KOPTContext caching actually work by ensuring its hash is stable.
* Ensure that going from one to the other tears down the former and
its plugins before instantiating the latter and its plugins.
UIManager: Unify Event sending & broadcasting
* Make the two behave the same way (walk the widget stack from top to
bottom), and properly handle the window stack shrinking shrinking
*and* growing.
Previously, broadcasting happened bottom-to-top and didn't really
handle the list shrinking/growing, while sending only handled the list
shrinking by a single element, and hopefully that element being the one
the event was just sent to.
These two items combined allowed us to optimize suboptimal
refresh behavior with Menu and other Menu classes when
opening/closing a document.
e.g., the "opening document" Notification is now properly regional,
and the "open last doc" option no longer flashes like a crazy person
anymore.
Plugins: Allow optimizing Menu refresh with custom menus, too.
Requires moving Menu's close_callback *after* onMenuSelect, which, eh,
probably makes sense, and is probably harmless in the grand scheme of
things.
Plugins are loaded *once*, but torn-down/instantiated multiple times,
and sometimes in the reverse order.
As such, if we use a public function member as the scheduled task, we're
always pointing to the same function, and going from FM to RD
effectively *un*schedules it.
Instead, use an instance-specific closure, so that each instance
schedules & unschedules don't affect each other.
In the same vein, settings ought to be read at instantiation, not at
loading, otherwise, changing a setting in the FM, then switching to the
reader will not pick up the changes.
* PluginLoader: Allow querying whether a specific plugin is loaded (instantiated, actually).
Re #7598
* PluginLoader: Add a method to access a specific Plugin's instance
(Besides `self.ui[plugin_name]`, that is).
Requires some nastiness to avoid pinning stale references in memory :s.
* PluginLoader: Tweak genPluginManagerSubItem to keep from rebuilding `self.all_plugins`, it's using `loadPlugins`, which is cached, so it made no sense to re-compute this one.
