[Libreoffice] [REVIEW] Fix for fdo#37520

[Kohei Yoshida]

The attached patch fixes the crasher reported in

https://bugs.freedesktop.org/show_bug.cgi?id=37520

The crash occurs in ScRangeList::Join() where the array size is cached
prior to the for loop, but array may shrink during the loop, in which
case an out-of-bound array access may occur which in turn results in a
crash.  I'm actually surprised that this didn't cause a crash on
Linux.

Anyhow, the solution is to always dynamically check the size of the
array via size() method in each iteration, instead of caching it for
all iterations.

Review appreciated.  I'd like this to go into the -3-4-0 branch.  So I
need three sign-off's.

Kohei
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