In font selection menus, ask creengine for italic versions
of fonts if there's no regular version to preview.
Also prevents a crash when a font can't be previewed in
the font family menu.
setIcon recreates the frame without preserving the current frame's
invert status (which is arguably a bug, but button is so ubuquitous that
I dare not touch that behavior...).
So, instead, rely on the rarely used preselect flag to preserve it.
When footnotes are displayed as "popups", they're displayed over ReaderUI
in a BottomContainer, so they pretty much always cover the footer ;).
(i.e., they're really really not popups *at all* :D).
This prevents spurious status bar auto-refreshes.
Re #12323
Input events from ImageViewer can be caught between it clearing an old
ImageWidget & instantiating a new one, but before the new one has had a
chance to actually render anything.
Fix#12327
While #12256 papered over the tracking of a *single* suspend -> (resume->suspend) series of events, things still go out of sync if you tack on *more* suspend/resume events after that.
The upside is that our *actual* tracking of suspend/resume is solid, so at least we're actually doing the right thing as far as PM is concerned.
The downside is that on Kobo, the frontlight handling code is full of delays, and the ramping down/up itself also takes some time, so things can quickly overrun into the wrong event.
This means a couple of things:
* We need to cancel any scheduled frontlight toggles and ramps on Kobo, to ensure that only the one from the *last* event received goes through, in an attempt to limit the amount of potential crossover.
* Tracking fl_was_on *cannot* reliably be done from the suspend/resume handlers (especially on Kobo), as the ramps themselves may cross over the event barriers (and we potentially cancel the task anyway), so this was moved to the very few interactive callers that will actually change the frontlight state.
* On Kobo, crossover is still *somewhat* possible because the ramps take time. It's mostly harmless for the ramp down, we just need to tweak the ramp down to start from the actual intensity to avoid a weird jump on the initial step if there's an inconsistency. For the ramp up, we potentially need to manually kill the light first, because off -> on assumes it *really* starts from off ;).
Followup to #12256Fix#12246 (again)
Prevent crash:
```
./luajit: frontend/util.lua:1092: attempt to get length of local 'str' (a nil value)
stack traceback:
frontend/util.lua:1092: in function 'fixUtf8'
frontend/ui/network/manager.lua:1109: in function 'requestToTurnOnWifi'
[…]
```
Namely, in the face of wpa_supplicant doing multiple scans. Note that a backend PR will make this largely redundant, by actually fixing the core issue in our backend ;).
Also add more logging around the authentication status.
* UIManager: Let the fb backend deal with Kaleido wfm promotion. This fixes a number of quirks that poisoned the refresh queue with spurious full-screen refreshes. See https://github.com/koreader/koreader-base/pull/1865 for more details.
* This also means we now disable Kaleido waveform modes when color rendering is disabled (remember to trash your thumbnail cache if you don't want to mix color w/ grayscale thumbnails, though).
* UIManager: Merge refreshes that share an edge, because that was driving me nuts (and would have most likely been merged by the kernel anyway). A perfect test-case is the FM, which trips two separate refreshes because of its title bar.
* ReaderFlipping: Use sensible dimensions, so that we only refresh the icon's region.
* ReaderBookmark: Only refresh the dogear instead of the whole page when toggling bookmarks.
* NetworkSetting: Make it a real boy, so it consistently refreshes properly on dismiss instead of relying on UIManager saving the day.
* Kobo: Aggressively prevent *both* suspend & standby while MTK devices are plugged-in, as both will horribly implode the kernel (we previously only prevent standby while charging).
* Kobo: Switch to 8bpp on B&W MTK devices (or when color rendering is disabled on Kaleido panels).
Latest MuPDF update changed HTML parsing, and use a better
HTML5 parser, which may cause some issues with the XHTML
we get from crengine.
So, for footnote popups, be sure we use MuPDF's XHTML parser.
Devices with a single target might want to specify it in `Device.ota_model`
Devices with multiple targets want to override the function or to specify `ota_model` variants for each target.
* Kindle: Implement a NetworkMgr backend loosely based on WpaClient in order to allow feature-parity with hasWifiManager platforms. This involves dealing with the native wifid over lipc (the native IPC system, based on DBus), through custom Lua bindings (https://github.com/notmarek/openlipclua), since the stock ones lack support for the needed hasharray data type.
* NetworkMgr: Clear up leftover hallucinations from #10669, making `enableWifi` much simpler (and much more similar to `turnOnWifiAndWaitForConnection`).
* NetworkMgr: Made it clearer that `turnOnWifi` implementations *must* deal with `complete_callback`, as part of the aforementioned changes mean that it's *always* wrapped in a connectivity check, and we need that for proper event signaling.
* Android, Emu: Run `complete_callback` properly in `turnOnWifi`.
* Kindle: Support `powerd:isCharged()` on the PW2 (yes, this is random, it just happened to be my test device :D).
* NetworkMgr:disableWifi: Properly tear down any potential ongoing connection attempt (e.g., connectivity check).
* NetworkMgr:promptWifi: Make the "wifi enabled but not connected" popup clearer if there's an ongoing connection attempt, and gray out the "Connect" button in this case (as it would only lead to another "connection already in progress" popup anyway).
* NetworkMgr:reconnectOrShowNetworkMenu: Make *total* scanning failures fatal (they will lead to an immediate wifi teardown).
* NetworkMgr:reconnectOrShowNetworkMenu: Clear up the long-press behavior (which *always* shows the network list popup) so that it doesn't weirdly break all the things (technical term!).
* NetworkMgr:reconnectOrShowNetworkMenu: When we manage to connect to a preferred network on our own *before* showing the network list, make sure it is flagged as "connected" in said list.
* NetworkMgr:reconnectOrShowNetworkMenu: Make connection failures fatal in non-interactive workflows (they'll lead to a wifi teardown).
* NetworkSetting (the aforementioned network list widget): Clear NetworkMgr's "connection pending" flag on dismiss when nothing else will (i.e., when there's no connectivity check ticking).
