DataGrid: improve handling of left/right arrow keys when editing text
DataGrid: improve handling of left/right arrow keys when editing text

punker76/PropertyTools,jogibear9988/PropertyTools,Mitch-Connor/PropertyTools,ZHZG/PropertyTools,johnsonlu/PropertyTools,jogibear9988/PropertyTools,ZHZG/PropertyTools,objorke/PropertyTools,LavishSoftware/PropertyTools