BMesh: mesh-data picking, general improvements

Generalize logic for vert/edge/face selection:
- index cycling.
- selection bias with mixed modes.

Details:
- Edges now support index cycling (as verts/faces did already)
- Cycling over near elements is now only enabled when the mouse position remains the same.
- No longer do 2 selection passes to perform index cycling.

Fixes:
- Edges behind the view could be selected (surprising nobody reported!)
- Selection bias now only changes the element that gets picked without interning the return distance
  (was buggy with mixed modes).

1 files changed, 6 insertions, 8 deletions

diff --git a/source/blender/editors/include/ED_mesh.h b/source/blender/editors/include/ED_mesh.h
index 3c672362a54..b982ff2a83b 100644
--- a/source/blender/editors/include/ED_mesh.h
+++ b/source/blender/editors/include/ED_mesh.h
@@ -137,20 +137,18 @@ bool EDBM_backbuf_border_mask_init(struct ViewContext *vc, const int mcords[][2]
                                    short xmin, short ymin, short xmax, short ymax);
 bool EDBM_backbuf_circle_init(struct ViewContext *vc, short xs, short ys, short rads);
 
-struct BMVert *EDBM_vert_find_nearest_ex(
-        struct ViewContext *vc, float *r_dist,
-        const bool use_select_bias);
+struct BMVert *EDBM_vert_find_nearest_ex(struct ViewContext *vc, float *r_dist,
+        const bool use_select_bias, bool use_cycle);
 struct BMVert *EDBM_vert_find_nearest(
         struct ViewContext *vc, float *r_dist);
 
-struct BMEdge *EDBM_edge_find_nearest_ex(
-        struct ViewContext *vc, float *r_dist,
-        const bool use_select_bias);
+struct BMEdge *EDBM_edge_find_nearest_ex(struct ViewContext *vc, float *r_dist,
+        const bool use_select_bias, const bool use_cycle);
 struct BMEdge *EDBM_edge_find_nearest(
         struct ViewContext *vc, float *r_dist);
 
-struct BMFace *EDBM_face_find_nearest_ex(
-        struct ViewContext *vc, float *r_dist,
+struct BMFace *EDBM_face_find_nearest_ex(struct ViewContext *vc, float *r_dist,
+        const bool use_select_bias, const bool use_cycle,
         struct BMFace **r_efa_zbuf);
 struct BMFace *EDBM_face_find_nearest(
         struct ViewContext *vc, float *r_dist);