re-enable user preferences for current editor line color (bug #62984) * gui-preferences-ed.h: include gui-settings instead of gui-preferences, new gui-pref for current line color with magenta as default for automatic computation of the color * gui-settings.h: more detailed comment for settings_color_no_change * file-editor-tab.cc (update_lexer_settings): compute and/or set current line color depending on color mode and user preference * settings-dialog.cc (settings_dialog): rename ed_mode in mode, add and initialize color picker for current line color; (update_editor_lexers): get current color for new color picker; (write_lexer_settings): read value from color picker and wirte it to file * settings-dialog.ui: update layouts for including new color picker

To cite GNU Octave in publications use:

  John W. Eaton, David Bateman, Søren Hauberg, Rik Wehbring (2022).
  GNU Octave version 7.2.0 manual: a high-level interactive language for
  numerical computations.
  URL https://www.gnu.org/software/octave/doc/v7.2.0/

A BibTeX entry for LaTeX users is:

  @manual{,
    title     = {{GNU Octave} version 7.2.0 manual: a high-level interactive language for numerical computations},
    author    = {John W. Eaton and David Bateman and S{\o}ren Hauberg and Rik Wehbring},
    year      = {2022},
    url       = {https://www.gnu.org/software/octave/doc/v7.2.0/},
  }

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.