- add a temp var for edge scanfill (fits in 4 bytes alignment - won't increase mem usage)

- make keyindex an unsigned int, since its used to store vertex indices
- use BLI_in_rcti_v for IN_2D_VERT_SCROLL and IN_2D_HORIZ_SCROLL

source/blender/blenlib/BLI_scanfill.h

@@ -70,7 +70,7 @@ typedef struct ScanFillVert {
 	} tmp;
 	float co[3]; /* vertex location */
 	float xy[2]; /* 2D copy of vertex location (using dominant axis) */
-	int keyindex; /* original index #, for restoring  key information */
+	unsigned int keyindex; /* original index #, for restoring  key information */
 	short poly_nr;
 	unsigned char f, h;
 } ScanFillVert;
@@ -80,6 +80,9 @@ typedef struct ScanFillEdge {
 	struct ScanFillVert *v1, *v2;
 	short poly_nr;
 	unsigned char f;
+	union {
+		unsigned char c;
+	} tmp;
 } ScanFillEdge;
 
 typedef struct ScanFillFace {