right click does not work on linux

[1000TurquoisePogs]

#47 added right click but i can't get it to work on linux. works fine elsewhere. on linux i get:

[2151428:1002/165227.504757:ERROR:x11_software_bitmap_presenter.cc(142)] XGetWindowAttributes failed for window 67108936
[2151428:1002/165227.505614:warning:connection.cc(41)] X error received.  Request: CreateGCRequest, Error: DrawableError{.sequence = 636, .bad_value = 67108936, .minor_opcode = 0, .major_opcode = 55}
[2151428:1002/165227.506730:warning:connection.cc(41)] X error received.  Request: FreeGCRequest, Error: GContextError{.sequence = 638, .bad_value = 73400370, .minor_opcode = 0, .major_opcode = 60}