ExternalEditor: Detect text changes in order to get cell updated
Connect to QTextEdit::textChanged signal, not ExternalEditor::textChanged.
Also rename textChanged to textModified as same signal name in sub- and super class can be confusing.
Connect to QTextEdit::textChanged signal, not ExternalEditor::textChanged.
Also rename textChanged to textModified as same signal name in sub- and super class can be confusing.