connectToExistingWorkbench fails on linux
Created originally on Bitbucket by kiilerix (Mads Kiilerich)
thg behaves as if --newworkbench always has been specified.
(I don't use "workbench" but is ok with 'thg dirname' launching my repo on a different tab. Always using new new windows for each thg invocation would be ok if thg set WM_CLASS and WM_NAME so the WM knew how to group the windows and show their names.)