View3D: Cursor Snap Refactor

Make the snap system consistent with the placement tool and leak-safe.

**Changes:**
- Store `SnapCursorDataIntern` in a `static` variable;
- Initialize (lazily) `SnapCursorDataIntern` only once (for the keymap).
- Move setup members of `V3DSnapCursorData` to a new struct `V3DSnapCursorState`
- Merge `ED_view3d_cursor_snap_activate_point` and `ED_view3d_cursor_snap_activate_plane` into `state = ED_view3d_cursor_snap_active()`
- Merge `ED_view3d_cursor_snap_deactivate_point` and `ED_view3d_cursor_snap_deactivate_plane` into `ED_view3d_cursor_snap_deactive(state)`
- Be sure to free the snap context when closing via `ED_view3d_cursor_snap_exit`
- Use RNA properties callbacks to update the properties of the `"Add Primitive Object"` operator

1 files changed, 2 insertions, 0 deletions

diff --git a/source/blender/windowmanager/intern/wm_init_exit.c b/source/blender/windowmanager/intern/wm_init_exit.c
index d4ef14bbf5d..d0693d37ef4 100644
--- a/source/blender/windowmanager/intern/wm_init_exit.c
+++ b/source/blender/windowmanager/intern/wm_init_exit.c
@@ -119,6 +119,7 @@
 #include "ED_space_api.h"
 #include "ED_undo.h"
 #include "ED_util.h"
+#include "ED_view3d.h"
 
 #include "BLF_api.h"
 #include "BLT_lang.h"
@@ -547,6 +548,7 @@ void WM_exit_ex(bContext *C, const bool do_python)
 
   ED_preview_free_dbase(); /* frees a Main dbase, before BKE_blender_free! */
   ED_assetlist_storage_exit();
+  ED_view3d_cursor_snap_exit();
 
   if (wm) {
     /* Before BKE_blender_free! - since the ListBases get freed there. */