comparison layer/Colour3DPlotLayer.cpp @ 1431:af824022bffd single-point

Begin fixing the various snap operations. Also remove SnapNearest, which is never used and seems to consume more lines of code than the rest!

     sv_frame_t right = left + resolution;
 
     switch (snap) {
     case SnapLeft:  frame = left;  break;
     case SnapRight: frame = right; break;
-    case SnapNearest:
     case SnapNeighbouring:
         if (frame - left > right - frame) frame = right;
         else frame = left;
         break;
     }