[gimp] (5 commits) Non-fast-forward update to branch wip/wormnest/xcf-parasite

[Jehan <jehanp src gnome org>]

The branch 'wip/wormnest/xcf-parasite' 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:

  4a7f1d6... app: fix #3928 GIMP cannot open .xcf

Commits added to the branch:

  8b10259... app: Smoother zooming while dragging with the mouse (*)
  505a78e... app: Add option to re-enable previous drag-to-zoom behavior (*)
  4cffd91... app: Halve the rate of distance-based drag-to-zoom scaling (*)
  eb58b27... app: Add drag-to-zoom speed preference (*)
  5b39bc9... app: fix #3928 GIMP cannot open .xcf

(*) This commit already existed in another branch; no separate mail sent