I have a form with several fields (a,b,c) and a button. The button should
only be enabled when
the cursor is in field b. How can I tell when the cursor is in that field?
builder newButtonFor: self
action: #openLessonListEditor
getEnabled: #hasSelectedCurrentLesson
label: 'Edit current lesson'
help: 'Edit current lesson'.
I want #hasSelectedCurrentLesson to return true only when the
cursor is in field b.
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