`UpdateButtonGeometry()`: specify "QPlainTextEdit" for `TextEdit`
padding (Comment and Lyrics) and invert left/right padding for
`LineEdit` if layout direction RTL
`set_reset_button()` in `UpdateModifiedField()` and catering for
non-text in `IsValueModified()` (-1 original being same as 0);
use new `ExtendedEditor::set_font()`;
connect reset for "rating".
Make "comment" `tabChangesFocus` to keep tab chain.
ExtendedEditor: New `set_font()` to get emboldened font to work and
make reset feedback work for `CheckBox` and `RatingBox` by
overriding `Resize()`.
RatingWidget: Allow tabbed focus and implement keyboard input.
There are some iPods which do not support ALAC, but they are quite rare. Anything 3rd gen
and newer, which most people are likely to be using, will work if upgraded to the latest
firmware (they probably are already on it...)
Like the card index, the card id is guaranteed to be unique. While card
index can easily change between reboots, the card id is based on the
actual audio hardware and does not change between reboots; or even
hardware changes. This makes using the card id preferable, because it
will "just work" 99% of the time, and removes the need to force cards to
have a specific index.
There is a corner case where card ids may change between reboots: If you
have two (or more) of the same audio hardware in the system. But that
should be rare enough, and requires explicit system configuration
anyway, so using the "custom" option should work here.
If there is an previously-saved index-based ALSA device in the config,
it will continue to work as-is and does not need to be migrated. There
is only a small UI side-effect: Because the index-based device will no
longer match any found id-based device, the settings window will show it
as "custom". Simply selecting the ALSA device from the drop-down again
will change it to the id-based device.
