Directly calling subprocess.Popen without checking the presence of the
program is the optimal solution because:
1) Avoids race condition, where the program disappears between the
check and the Popen call.
2) Popen will raise exception if the program is absent anyway,
no race condition here.
Fix 3 issues with the Draft Tray layer list:
The layer list should display even if there are no layers so that the "Add new Layer" option can be selected.
"Project" and "BuildingPart" objects should be added to the list (depending on "AutogroupAddGroups" of course).
The "LayerContainer" object should not be added to the list. Although it is in fact a group, it is just too confusing.
Fix 3 issues with the Draft Tray layer list:
The layer list should display even if there are no layers so that the "Add new Layer" option can be selected.
"Project" and "BuildingPart" objects should be added to the list (depending on "AutogroupAddGroups" of course).
The "LayerContainer" object should not be added to the list. Although it is in fact a group, it is just too confusing.
Added is_group function. This function can also be used in gui_groups.py.
The direction of the offset could be faulty if Draft precision=6. Since we are only interested in the side the pointer is on, working with a high precision does not make sense.
Found via `codespell -q 3 -L aci,ake,aline,alle,alledges,alocation,als,ang,anid,apoints,ba,beginn,behaviour,bloaded,bottome,byteorder,calculater,cancelled,cancelling,cas,cascade,centimetre,childs,colour,colours,commen,connexion,currenty,dof,doubleclick,dum,eiter,elemente,ende,feld,finde,findf,freez,hist,iff,indicies,initialisation,initialise,initialised,initialises,initialisiert,ist,kilometre,lod,mantatory,methode,metres,millimetre,modell,nd,noe,normale,normaly,nto,numer,oder,ontop,orgin,orginx,orginy,ot,pard,parms,pres,programm,que,recurrance,rougly,seperator,serie,sinc,strack,substraction,te,thist,thru,tread,uint,unter,vertexes,wallthickness,whitespaces -S ./.git,*.po,*.ts,./ChangeLog.txt,./src/3rdParty,./src/Mod/Assembly/App/opendcm,./src/CXX,./src/zipios++,./src/Base/swig*,./src/Mod/Robot/App/kdl_cp,./src/Mod/Import/App/SCL,./src/WindowsInstaller,./src/Doc/FreeCAD.uml,./build/doc/SourceDocu`