[gtksourceview] (3 commits) Non-fast-forward update to branch wip/gutter-draw-refactoring

[Sébastien Wilmet <swilmet src gnome org>]

The branch 'wip/gutter-draw-refactoring' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  c43f8ba... gutter: split on_view_draw: draw_cells()

Commits added to the branch:

  97708e0... gutter: split on_view_draw: draw_cells()
  71fa456... gutter: better variable name for the renderer widths
  baa9b31... gutter: better variable name for the lines count