Fix a precision issue when TGraph2D was drawn with the option LINE.
Fix a precision issue when TGraph2D was drawn with the option LINE.

This issue was reported here: https://sft.its.cern.ch/jira/browse/ROOT-9046
PaintLine as now the same logic as PaintPolyMarker to decide if a point
is in the range or not.

karies/root,karies/root,root-mirror/root,zzxuanyuan/root,zzxuanyuan/root,karies/root,olifre/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,zzxuanyuan/root,karies/root,zzxuanyuan/root,olifre/root,zzxuanyuan/root,zzxuanyuan/root,zzxuanyuan/root,zzxuanyuan/root,root-mirror/root,olifre/root,karies/root,karies/root,zzxuanyuan/root,root-mirror/root,olifre/root,olifre/root,karies/root,olifre/root,olifre/root,zzxuanyuan/root,root-mirror/root,zzxuanyuan/root,zzxuanyuan/root,karies/root,olifre/root,root-mirror/root,karies/root,olifre/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root