[QScintilla] QScintilla crash upon second word separator in a string

[Jack Cosgrove]

Thanks! It wasn't a ghost in the machine after all.

I was running Ubuntu 11.10 when this happened.

On Mon, Apr 2, 2012 at 9:00 AM, Phil Thompson
<phil at riverbankcomputing.com>wrote:

> On Sat, 24 Mar 2012 15:03:41 -0500, Jack Cosgrove <jackcosgrove at gmail.com>
> wrote:
> > Update on this: I received further crashes with the code alteration I
> > produced. Upon further inspection it seemed that the error was occurring
> > not because the iterator had proceeded past the end of the raw_apis
> > string list, but rather because the iterator was initialized at a
> > location not within the range of the string list. That's consistent with
> > the behavior I observed, in that the crash would only occur the first
> > time function arguments were suggested after application startup. If the
> > location of the "it" iterator could be properly initialized somehow,
> > such as through the workaround user behavior in my first message, then
> > all subsequent function argument suggestions worked correctly.
> >
> > With this code starting after line 658 in qsciapis.cpp
> >
> > if (it < prep->raw_apis.begin())
> >             it = prep->raw_apis.begin();
> >
> > I can avoid crashes. However the first time that function arguments
> > should be suggested nothing happens. All subsequent suggestions work
> > correctly.
> >
> > Thanks to Phil and Gedalia for taking the time to help me.
>
> I was able to reproduce this - it seems to be a Linux specific problem,
> and maybe even a compiler bug. My best workaround is to add...
>
>    prep->raw_apis.begin();
>
> ...to the end of the autoCompletionSelected() method, just after the call
> to qLowerBound().
>
> Phil
>
> > On Tue, 2012-03-20 at 12:20 +0000, Phil Thompson wrote:
> >> On Sat, 17 Mar 2012 12:58:48 -0500, Jack Cosgrove
> >> <jackcosgrove at gmail.com>
> >> wrote:
> >> > Hi,
> >> >
> >> > I am encountering crashes when I try to use autocomplete to fill in
> >> > function arguments using the Python lexer. For example, given an API
> >> > entry of "foo.bar(foo, bar)", I will always be prompted for foo and
> >> > bar,
> >> > but if I accept the autocompletion for "bar" and then type an opening
> >> > parenthesis my app crashes.
> >> >
> >> > Attached is a small example demonstrating this behavior. Type in
> "fo",
> >> > accept the suggestion, then ".", accept "bar", then "(" to replicate.
> >> >
> >> > However, if you type in "fo", accept, then ".bar(", then delete the
> >> > "(",
> >> > you can then type "(" again and encounter the function argument
> >> > suggestion. After this happens the first time the application never
> >> > crashes, even if replicating the first procedure on a new line.
> >> >
> >> > Thanks to all who reply for your help!
> >>
> >> I can't reproduce this with current versions of QScintilla and Qt. What
> >> versions are you using?
> >>
> >> Phil
>
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