textbox-autoheight (#1009)
* textbox-autoheight
- add max-lines to textbox
* textbox-autoheight
- reformat
* textbox-autoheight
- add demo
* textbox-autoheight
- tweaks on scripts
* textbox-autoheight
- fix tests
* textbox-autoheight
- fix tests
* textbox-autoheight
- fix tests
* textbox-autoheight
- convert default max_height from 100 to 20
* textbox-autoheight
- convert default max_height from 100 to 20
