Mouse bindings appear to not be wrapped in userCode

[geekosaur]

Problem Description

From IRC:

[16 19:52:39] <beastwick> could my keybind some how be triggering xmonad to close for some reason?
[16 19:52:45] <beastwick> as if I did a control shift q
[16 19:53:40] <geekosaur> I expect that planeMove is crashing, and from glancing over the code I expect it's referencing past the end of a list and (!!) is throwing an exception
[16 19:54:16] <geekosaur> I'm not sure we wrap those in userCode to catch exceptions
[16 19:54:24] <beastwick> is there a haskell debugger? something I could attach to the xmonad process and step through code?
[16 19:55:05] <geekosaur> since it's native code you would use gdb or lldb, but ghc's debugger support isn't very good at present
[16 19:57:51] <geekosaur> hm. you could change the binding to: \w -> catchX (planeMove (Lines 4) Circular ToUp) (return ())
[16 19:58:08] <geekosaur> that won't make the key work but it should log the error and continue
[16 19:59:03] <geekosaur> (and if it does then I need to file a bug that we aren't guarding mouse bindings properly)
[16 20:03:00] <beastwick> okay I wrapped it in a catch, no crashing now

Checklist

• I've read CONTRIBUTING.md

• I tested my configuration

  • With xmonad version 0.17.0
  • With xmonad-contrib version 0.17.0

[geekosaur]

https://github.com/xmonad/xmonad/blob/master/src/XMonad/Main.hs#L359