Image Paint:

- Code for brush spacing and timing was rewritten, making spacing more even.
  Example: http://users.pandora.be/blendix/brush_spacing.jpg
- Instead of Stepsize for regular brushes and Flow for airbrushes, there is
  now Spacing for both, and Rate for airbrushes.
- Airbrush now works more like it does in the Gimp now, by maintaining the
  spacing even if the brush moves faster than the painting rate.

- Some preparations to make brushes work in texture paint mode.

source/blender/src/space.c

@@ -835,7 +835,7 @@ static void winqreadview3dspace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 	Object *ob= OBACT;	/* do not change! */
 	float *curs;
 	int doredraw= 0, pupval;
-	unsigned short event= evt->event;
+	unsigned short event= evt->event, origevent= evt->event;
 	short val= evt->val;
 	char ascii= evt->ascii;
 	
@@ -1011,7 +1011,7 @@ static void winqreadview3dspace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 					vertex_paint();
 				}
 				else if (G.f & G_TEXTUREPAINT) {
-					texturepaint_paint();
+					texturepaint_paint(origevent==LEFTMOUSE? L_MOUSE: R_MOUSE);
 				}
 				break;
 			case MIDDLEMOUSE: