Clear text on prompt launch
Clear text on prompt launch

The text buffer is now cleared whenever the dialog window appears.

Keep in mind that the text_buffer that your application receives will be
the text_buffer that is wiped when the dialog pops up, so if the
entered string is needed for later, it should be copied.

Signed-off-by: Ricky Ayoub <d540a1d104347729683d6fbdc06ebedcf37ea088@gmail.com>

vgmoose/tertiary_text,vgmoose/tertiary_text