bugfixes for ArrowItem __init__
bugfixes for ArrowItem __init__

ericdill/pyqtgraph,ddamiani/pyqtgraph,mpvismer/pyqtgraph,JenSte/pyqtgraph,hiuwo/acq4,onlyjus/pyqtgraph,tropp/acq4,benvermaercke/pyqtgraph,ng110/pyqtgraph,benvermaercke/pyqtgraph,meganbkratz/acq4,carlomt/dicom_tools,gvalentine/pyqtgraph,pmaunz/pyqtgraph,hiuwo/acq4,benvermaercke/pyqtgraph,derricw/pyqtgraph,tropp/acq4,wonkoderverstaendige/MausverPyler,tropp/acq4,mgraupe/acq4,meganbkratz/acq4,pbmanis/acq4,mgraupe/acq4,ddamiani/pyqtgraph,duguxy/pyqtgraph,meganbkratz/acq4,duguxy/pyqtgraph,hiuwo/acq4,welshjf/pyqtgraph,petebachant/pyqtgraph,hiuwo/acq4,campagnola/acq4,gvalentine/pyqtgraph,Lx37/pyqtgraph,meganbkratz/acq4,acq4/acq4,gvalentine/pyqtgraph,Lx37/pyqtgraph,onlyjus/pyqtgraph,JenSte/pyqtgraph,ericdill/pyqtgraph,acq4/acq4,ericdill/pyqtgraph,pbmanis/acq4,stscieisenhamer/pyqtgraph,ng110/pyqtgraph,campagnola/acq4,mgraupe/acq4,mgraupe/acq4,acq4/acq4,vallsv/pyqtgraph,campagnola/acq4,jlombacher/pyqtgraph,tropp/acq4,pbmanis/acq4,pmaunz/pyqtgraph,nmearl/pyqtgraph,nmearl/pyqtgraph,ddamiani/pyqtgraph,jlombacher/pyqtgraph,mpvismer/pyqtgraph,acq4/acq4,stscieisenhamer/pyqtgraph,pbmanis/acq4,hiuwo/acq4,petebachant/pyqtgraph,derricw/pyqtgraph,onlyjus/pyqtgraph,campagnola/acq4,vallsv/pyqtgraph,mgraupe/acq4,welshjf/pyqtgraph,welshjf/pyqtgraph,wonkoderverstaendige/MausverPyler,carlomt/dicom_tools