improves textfield handling

[n1LS]

Implements #1302

[maks]

This looks good for remembering the last entered character but we can't use EDIT_ENTER+UP/DOWN for jumping through char ranges because on screens with the waveform display that is already used for zoom in/out.

[n1LS]

This looks good for remembering the last entered character but we can't use EDIT_ENTER+UP/DOWN for jumping through char ranges because on screens with the waveform display that is already used for zoom in/out.

Suggestions? UIField doesn't get all key presses, so - depending on the combo - we either need to make due with what we have or extend the UIField to have broader access to the input.