So far, when deleting the selected text, the proper lines are reported as being deleted when the selection is deleted be a key command (delete or backspace) or replaced by typing a character. The cut and delete actions (from the Edit menu or tool bar) also need to be handled.
The cut() function from the QPlainTextEdit class was reimplemented in the EditBox class and a call to the QplainTextEdit::cut() function was added. Before this call, the current selection is saved. After the call, the function implemented for key press deletion of selections that detects deleted lines is called.
The remove() function was already implemented to delete the selected text (not to the clipboard). Similar to the new cut() function, the selection is saved before the text is deleted and the deleted lines are captured afterward.
[commit 5c3e16f9e8]
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