fix https://savannah.cern.ch/bugs/index.php?83910.
fix https://savannah.cern.ch/bugs/index.php?83910.

In TGraphPainter::PaintGraphErrors and related functions, the caps that are drawn when option "[]" is specified are drawn as a sequence of three separate lines. This results in an ugly concave jag at each corner. The caps are now drawn using TPad::PaintPolyLine, the default miter line joins makes those jags go away.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@40950 27541ba8-7e3a-0410-8455-c3a389f83636

mhuwiler/rootauto,agarciamontoro/root,lgiommi/root,cxx-hep/root-cern,mkret2/root,0x0all/ROOT,mattkretz/root,bbockelm/root,olifre/root,root-mirror/root,omazapa/root,georgtroska/root,agarciamontoro/root,zzxuanyuan/root-compressor-dummy,georgtroska/root,kirbyherm/root-r-tools,Duraznos/root,mkret2/root,gbitzes/root,root-mirror/root,omazapa/root-old,georgtroska/root,zzxuanyuan/root,cxx-hep/root-cern,veprbl/root,vukasinmilosevic/root,sawenzel/root,veprbl/root,omazapa/root-old,simonpf/root,esakellari/root,mattkretz/root,beniz/root,gbitzes/root,cxx-hep/root-cern,zzxuanyuan/root-compressor-dummy,sirinath/root,alexschlueter/cern-root,sirinath/root,cxx-hep/root-cern,zzxuanyuan/root-compressor-dummy,mkret2/root,olifre/root,karies/root,evgeny-boger/root,vukasinmilosevic/root,esakellari/my_root_for_test,BerserkerTroll/root,perovic/root,omazapa/root,mkret2/root,mhuwiler/rootauto,lgiommi/root,pspe/root,krafczyk/root,bbockelm/root,omazapa/root-old,nilqed/root,simonpf/root,mkret2/root,bbockelm/root,Duraznos/root,Duraznos/root,karies/root,dfunke/root,smarinac/root,sbinet/cxx-root,lgiommi/root,ffurano/root5,dfunke/root,agarciamontoro/root,sbinet/cxx-root,vukasinmilosevic/root,sbinet/cxx-root,agarciamontoro/root,evgeny-boger/root,karies/root,Dr15Jones/root,nilqed/root,sawenzel/root,mkret2/root,jrtomps/root,evgeny-boger/root,sbinet/cxx-root,lgiommi/root,karies/root,dfunke/root,krafczyk/root,Y--/root,davidlt/root,gbitzes/root,sbinet/cxx-root,jrtomps/root,olifre/root,gganis/root,omazapa/root-old,Y--/root,omazapa/root,Y--/root,vukasinmilosevic/root,nilqed/root,buuck/root,cxx-hep/root-cern,gganis/root,karies/root,tc3t/qoot,abhinavmoudgil95/root,lgiommi/root,jrtomps/root,buuck/root,simonpf/root,buuck/root,Y--/root,0x0all/ROOT,arch1tect0r/root,esakellari/my_root_for_test,jrtomps/root,olifre/root,zzxuanyuan/root,evgeny-boger/root,dfunke/root,tc3t/qoot,simonpf/root,krafczyk/root,perovic/root,davidlt/root,krafczyk/root,root-mirror/root,esakellari/root,veprbl/root,krafczyk/root,beniz/root,omazapa/root-old,satyarth934/root,dfunke/root,gbitzes/root,vukasinmilosevic/root,esakellari/my_root_for_test,arch1tect0r/root,tc3t/qoot,omazapa/root,davidlt/root,lgiommi/root,georgtroska/root,omazapa/root-old,Duraznos/root,Duraznos/root,mattkretz/root,root-mirror/root,davidlt/root,ffurano/root5,sirinath/root,sirinath/root,abhinavmoudgil95/root,alexschlueter/cern-root,thomaskeck/root,zzxuanyuan/root,zzxuanyuan/root-compressor-dummy,esakellari/root,georgtroska/root,root-mirror/root,beniz/root,CristinaCristescu/root,Duraznos/root,olifre/root,gganis/root,olifre/root,mhuwiler/rootauto,omazapa/root-old,davidlt/root,agarciamontoro/root,buuck/root,CristinaCristescu/root,nilqed/root,beniz/root,nilqed/root,georgtroska/root,abhinavmoudgil95/root,omazapa/root-old,BerserkerTroll/root,pspe/root,mattkretz/root,arch1tect0r/root,alexschlueter/cern-root,bbockelm/root,alexschlueter/cern-root,zzxuanyuan/root,Duraznos/root,sawenzel/root,evgeny-boger/root,nilqed/root,ffurano/root5,dfunke/root,alexschlueter/cern-root,omazapa/root,arch1tect0r/root,pspe/root,esakellari/root,arch1tect0r/root,gbitzes/root,mattkretz/root,nilqed/root,tc3t/qoot,0x0all/ROOT,mattkretz/root,pspe/root,kirbyherm/root-r-tools,vukasinmilosevic/root,0x0all/ROOT,smarinac/root,sawenzel/root,zzxuanyuan/root,BerserkerTroll/root,CristinaCristescu/root,Dr15Jones/root,ffurano/root5,krafczyk/root,mkret2/root,satyarth934/root,Dr15Jones/root,buuck/root,zzxuanyuan/root-compressor-dummy,olifre/root,beniz/root,mkret2/root,esakellari/my_root_for_test,perovic/root,pspe/root,lgiommi/root,perovic/root,satyarth934/root,bbockelm/root,lgiommi/root,tc3t/qoot,mkret2/root,omazapa/root-old,mhuwiler/rootauto,sbinet/cxx-root,abhinavmoudgil95/root,veprbl/root,satyarth934/root,zzxuanyuan/root,simonpf/root,esakellari/my_root_for_test,gganis/root,sirinath/root,omazapa/root-old,mkret2/root,tc3t/qoot,nilqed/root,Y--/root,root-mirror/root,thomaskeck/root,agarciamontoro/root,Dr15Jones/root,sawenzel/root,krafczyk/root,simonpf/root,beniz/root,bbockelm/root,CristinaCristescu/root,smarinac/root,CristinaCristescu/root,nilqed/root,arch1tect0r/root,thomaskeck/root,strykejern/TTreeReader,Y--/root,strykejern/TTreeReader,BerserkerTroll/root,ffurano/root5,simonpf/root,krafczyk/root,esakellari/root,cxx-hep/root-cern,sirinath/root,veprbl/root,veprbl/root,tc3t/qoot,lgiommi/root,ffurano/root5,zzxuanyuan/root,vukasinmilosevic/root,satyarth934/root,esakellari/root,nilqed/root,strykejern/TTreeReader,georgtroska/root,mhuwiler/rootauto,buuck/root,zzxuanyuan/root-compressor-dummy,esakellari/root,perovic/root,kirbyherm/root-r-tools,satyarth934/root,kirbyherm/root-r-tools,pspe/root,zzxuanyuan/root-compressor-dummy,gganis/root,tc3t/qoot,davidlt/root,sbinet/cxx-root,gganis/root,BerserkerTroll/root,satyarth934/root,abhinavmoudgil95/root,zzxuanyuan/root,arch1tect0r/root,omazapa/root,jrtomps/root,esakellari/root,root-mirror/root,jrtomps/root,sawenzel/root,omazapa/root,Dr15Jones/root,mattkretz/root,BerserkerTroll/root,perovic/root,tc3t/qoot,smarinac/root,veprbl/root,gbi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