UV: add grid shape source to the uv editor, and add new "pixel" option

This change is part of a wider set of changes to implement Grid and Pixel
snapping in the UV Editor. This particular change adds a new third option,
`pixel grid`, to the previous grid options, `dynamic grid` and `fixed grid`.

Maniphest Tasks : T78391

Differential Revision: https://developer.blender.org/D16197

1 files changed, 7 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/versioning_300.cc b/source/blender/blenloader/intern/versioning_300.cc
index 0584dd6b059..5328107e1f2 100644
--- a/source/blender/blenloader/intern/versioning_300.cc
+++ b/source/blender/blenloader/intern/versioning_300.cc
@@ -3604,6 +3604,13 @@ void blo_do_versions_300(FileData *fd, Library * /*lib*/, Main *bmain)
             v3d->overlay.flag |= V3D_OVERLAY_VIEWER_ATTRIBUTE;
             v3d->overlay.viewer_attribute_opacity = 1.0f;
           }
+          if (sl->spacetype == SPACE_IMAGE) {
+            SpaceImage *sima = (SpaceImage *)sl;
+            if (sima->flag & SI_FLAG_UNUSED_18) { /* Was #SI_CUSTOM_GRID. */
+              sima->grid_shape_source = SI_GRID_SHAPE_FIXED;
+              sima->flag &= ~SI_FLAG_UNUSED_18;
+            }
+          }
         }
       }
     }