bug#16711: 24.3.50; Error: pre-redisplay-function

[T. V. Raman]

loading something like cnn.com in eww appears to trigger it. But
the problem is that it doesn't *always* trigger it 
>>>>> "Stefan" == Stefan Monnier <monnier@iro.umontreal.ca> writes:
    >> I've been bitten by this intermitently for the last few
    >> weeks; it appears to be happening more often now. Observed
    >> initially in W3 when rendering heavy-weight web pages; it
    >> also shows up in eww. You get a variable depth exeeds max
    >> eval depth error repeatedly --
    Stefan> 
    Stefan> Hmm.. can you come up with a recipe to reproduce it?
    Stefan> 
    >> turning on debug doesn't yield any additional info.
    Stefan> 
    Stefan> Indeed, pre-redisplay-function is run at a time where
    Stefan> we can't conveniently redisplay, I think, so we can't
    Stefan> drop into the debugger.
    Stefan> 
    >> The fix appears to be to set pre-redisplay-function to nil
    Stefan> 
    Stefan> That's obviously just a workaround.
    Stefan> 
    >> --- looking at the code, I've not figured out what that
    >> variable does
    Stefan> 
    Stefan> The variable doesn't do anything, it's just a
    Stefan> hook. Its default value is used to implement the
    Stefan> highlighting of the active region.
    Stefan> 
    Stefan> 
    Stefan>         Stefan