Adjust history window copy/evaluate and remove carriage returns (bug #39722) * history-dock-widget.cc (history_dock_widget::handle_contextmenu_copy): Add prev_valid_row variable and only add carriage-return between valid lines of text. (history_dock_widget::handle_contextmenu_evaluate): Remove "\n" from end of line sent to Octave core. (history_dock_widget::handle_contextmenu_create_script) Add prev_valid_row variable and only add carriage-return between valid lines of text. (history_dock_widget::handle_double_click) Remove "\n" from end of line sent to Octave core. (history_dock_widget::pasteClipboard) Format consistent with elsewhere.

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