Remove unused UIManager:clearRenderStack().
Previously it was used by CoverBrowser plugin when extending the FileManager popup file dialog with aditional buttons.
Now the buttons are inserted through the api added in https://github.com/koreader/koreader/pull/12845.
Tweak `mergeTitleBarIntoLayout` to keep the current selection (adjusted for the added rows) instead of resetting the focus.
It only actually called `moveFocusTo` on `hasDPad` devices, which explains why this was missed during testing.
Fix https://github.com/koreader/koreader/pull/12583#issuecomment-2423554770
* FocusManager: Fix `focus_flags` check in `moveFocusTo` (0 is truthy in Lua, can't do AND checks like in C ;).)
* FileManager+FileChooser: Pass our custom title bar directly to FileChooser (which also means we can now use FC's FocusManager layout directly).
* FileChooser/Menu: Get rid of the weird `outer_title_bar` hack, and simply take a `custom_title_bar` pointer to an actual TitleBar instance instead.
* FileManager/Menu/ListMenu/CoverMenu: Fix content height computations in `_recalculateDimen` (all the non-FM cases were including an old and now unused padding value, `self.header_padding`, leading to more blank space at the bottom than necessary, and, worse, leading to different item heights between FM views, possibly leading to unnecessary thumbnail scaling !)
* ButtonDialog: Proper focus management when the ButtonTable is wrapped in a ScrollableContainer.
* ConfigDialog: Implement a stupid workaround for a weird FocusManager issue when going back from `[⋮]` buttons.
* ConfigDialog: Don't move the visual focus in `update` (i.e., we use `NOT_FOCUS` now that it works as intended).
* DictQuickLookup: Ensures the `Menu` key bind does the exact same thing as the hamburger icon.
* DictQuickLookup: Ensure we refocus after having mangled the FocusManager layout (prevents an old focus highlight from lingering on the wrong button).
* FileChooser: Stop flagging it as no_title, because it is *never* without a title. (This behavior was a remnant of the previous FM-specific title bar hacks, which are no longer a thing).
* FileChooser: Stop calling `mergeTitleBarIntoLayout` twice in `updateItems`. We already call Menu's, which handles it. (Prevents the title bar from being added twice to the FocusManager layout).
* FocusManager: Relax the `Unfocus` checks in `moveFocusTo` to ensure we *always* unfocus something (if unfocusing was requested), even if we have to blast the whole widget tree to do so. This ensures callers that mangle self.layout can expect things to work after calling it regardless of how borked the current focus is.
* FocusManager: Allow passing `focus_flags` to `refocusWidget`, so that it can be forwarded to the internal `moveFocusTo` call.
* FocusManager: The above also allows us to enforce a default that ensures we do *not* send a Focus event on Touch devices, even if they have the hasDPad devcap. This essentially restores the previous/current behavior of not showing the visual feedback from such focus "events" sent programmatically, given the `focus_flags` check fix at the root of this PR ;).
* InputDialog: Fix numerous issues relating to double/ghost instances of both InputText and VirtualKeyboard, ensuring we only ever have a single InputText & VK instance live.
* InputDialog: Make sure every way we have of hiding the VK play nice together, especially when the `toggleKeyboard` button (shown w/ `add_nav_bar`) is at play. And doubly so when we're `fullscreen`, as hiding the VK implies resizing the widget.
* InputText: Make sure we're flagged as in-focus when tapping inside the text field.
* InputText: Make sure we don't attempt to show an already-visible VK in the custom `hasDPad` `onFocus` handler.
* Menu: Get rid of an old and no longer used (nor meaningful) hack in `onFocus` about the initial/programmatically-sent Focus event.
* Menu: Get rid of the unused `header_padding` field mentioned earlier in the FM/FC fixes.
* Menu: Use `FOCUS_ONLY_ON_NT` in the explicit `moveFocusTo` call in `updatePageInfo`, so as to keep the current behavior of not showing the visual feedback of this focus on Touch devices.
* Menu: Make sure *all* the `moveFocusTo` calls are gated behind the `hasDPad` devcap (previously, that was only the case for `updatePageInfo`, but not `mergeTitleBarIntoLayout` (which is called by `updateItems`).
* MultiInputDialog: Actively get rid of the InputText & VK instances from the base class's constructor that we do not use.
* MultiInputDialog: Ensure the FocusManager layout is *slightly* less broken (password fields can still be a bit weird, though).
* TextViewer: Get rid of the unfocus -> layout mangling -> refocus hack now that `refocusWidget` handles this case sanely.
* VirtualKeyboard: Notify our parent InputDialog when we get closed, so it can act accordingly (e.g., resize itself when `fullscreen`).
* ScrollableContainer: Implement the necessary machinery for focus handling inside ButtonDialog (specifically, when scrolling via PgUp/PgDwn).
* TextEditor: Given the above fixes, the plugin is no longer disabled on non-touch devices.
* ReaderBookMark: Make sure we request a full refresh when closing the "Edit note" dialog, as CRe highlights may extend past its dimensions, and if it's closed separately from VK, the refresh would have been limited to its own dimensions, leaving a neat InputDialog-sized hole in the highlights ;).
* 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).
