edit a file from an error message in the terminal (bug #35619) * QTerminal.cc (handleCustomContextMenuRequested): move slot for the context menu from header file, detect an error location by regular expressions; (edit_file): slot context menu entry for editing a file in an error message * QTerminal.h: new signal for editing a file from an error message, slot handleCustomContextMenuRequested moved into QTerminal.cc, new edit action in the context menu, new slot for context menu entry, connect new edit signal to related slot in the main window * file-editor-tab.cc (handle_context_menu_edit): only keep searching for an embedded function, move the rest of the search into the editor, called via a new signal; (goto_line): center the new line in all cases * file-editor-tab.h: new signal for editing an m-file * file-editor.cc (handle_edit_mfile_request): partly moved from file-editor-tab; (construct): connect new signals from file-editor-tab and from main window to the new slot for searching and editing an m-file * file-editor.h: new slot for searching and editing an m-file * main-window.cc (edit_mfile): new slot for editing an m-file, just emitting the signal for the editor * main-window.h: new slot and new signal for editing an m-file

To cite GNU Octave in publications use:

  John W. Eaton, David Bateman, Søren Hauberg, Rik Wehbring (2015).
  GNU Octave version 4.0.0 manual: a high-level interactive language for
  numerical computations.
  URL http://www.gnu.org/software/octave/doc/interpreter/

A BibTeX entry for LaTeX users is:

  @book{,
    author    = {John W. Eaton, David Bateman, S\oren Hauberg, and Rik Wehbring},
    title     = {{GNU Octave} version 4.0.0 manual: a high-level interactive language for numerical computations},
    year      = {2015},
    url       = {http://www.gnu.org/software/octave/doc/interpreter},
  }

We have invested a lot of time and effort in creating GNU Octave, please cite it
when using it.  See also `citation pkgname' for citing Octave packages.