Improves the way we can write text to search a font, use up/down keys
to navigate through the font list, and use Enter/Esc keys to select
the font and go back to the text box.
This is the first (not yet production-ready) version of the
interactive Text tool. The text input is done with a transparent
ui::Entry, and on each text modification an ExtraCel is rendered with
this same ui::Entry's TextBlob to be displayed in the canvas with the
active zoom level.
The ui::Entry is being painted along the text in the canvas (just for
testing), but this is something to be fixed. Probably it will not be
the case in the future and a fully customized rendering (onPaint())
process will be required.
This new font selector list installed fonts with its proper name. It
still needs some extra work to select font set styles (regular, bold,
italic, etc.)
David Capello