exp cmd widget: prevent wirting in previous ouputs * command-widget.cc (console::console): initialize new variables, connect some qscintilla signals; (console::append_string): make text writable; (console::cursor_position_changed: slot for change cursor position, prevent deleting the prompt and set read only state depending on cursor location; (console::move_cursor_to_end): slot for attempt to edit read only text, move cursor to the end and add enttered key there if ti is printable; (text_changed): slot for text changed, remember chaged state for later use in the slot for cursor position changed; (console::keyPressEvent): store entered key as text * command-widget.h (console): new slots cursor_position_changed text_changed, and move_cursor_to_end, new class variable m_cursor_position, m_text_changed, and m_last_key_string