I have a normal NSTextField which i need to ensure has no line breaks
in it. It works well since there is a default button that traps the
enter and return keys. but if i go into TextEdit and type two lines
line 1
line 2
and copy both lines, and return to my app and paste the clip board
into the NSTextField, both lines are entered. you need to up arrow to
see the line 1 but it is there.
question: how do you stop the multi line input? NSTextFieldCell has a
set clip mode method but that is more about how the clipped text is
drawn. I need to stop it entering in the first place.
