The horizontally scrollable single-line text input box does not currently visible.
This patch turns it into a vertically scrollable multiline input box, with an
arbitrary minsize.
Also, make the label unselectable.
This test accepts a style string (as defined in the style_apply method)
and continuously applies it to a sample text block.
Useful for debugging Efl.Canvas.Textblock styles.
Reviewed-by: Cedric BAIL <cedric.bail@free.fr>
Differential Revision: https://phab.enlightenment.org/D10853