[erlang-bugs] GUI debugger Module view crashes in dual monitor setup

[Matthew Hegarty]

To reproduce

1.  debugger:start()
2.  Move Monitor window to secondary monitor (to LHS in my case)
3.  Module / Interpret  (choose module)
4.  Open Module View window
5.  It will crash as soon as there is a mouse move event with:

Error in process <0.2844.0> with exit value:
{badarith,[{dbg_ui_trace_win,handle_event,2,[{file,"dbg_ui_trace_win.erl"},{line,696}]},{dbg_ui_view,loop,1,[{file,"dbg_ui_view.erl"},{line,77}]}]}

line is:

dbg_ui_trace_win.erl
696     {coords, {gs:read(Win, x)+LastX-5, gs:read(Win, y)+LastY-5}};

Workaround:  Open the module view window before moving it to secondary
monitor, and then it won't crash.

===

Erlang R16B (erts-5.10.1) [source] [64-bit] [smp:4:4] [async-threads:10]
[kernel-poll:false]

Linux Mint 64bit:  3.5.0-17-generic #28-Ubuntu SMP Tue Oct 9 19:31:23 UTC
2012 x86_64 x86_64 x86_64 GNU/Linux

1st Monitor: Samsung 22" 1680 x 1050
2nd Monitor: Dell 19" 1290 x 1024
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