web commit by http://willthompson.co.uk/: file a bug about nested inlines failing

diff --git a/doc/bugs/nested_inlines_produce_no_output.mdwn b/doc/bugs/nested_inlines_produce_no_output.mdwn
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+If an inlined page itself contains an inline directive, the nested directive will produce no output.  In [this example wiki](http://www.willthompson.co.uk/tmp/ikiwiki-nested-inline/), the following pages exist:
+
+ * _pets_: contains some content, and the directive `inline pages="pets/* and !pets/*/*"` to inline its immediate children.
+ * _pets/dogs_: some content, and `inline pages="pets/dogs/*"`.
+ * _pets/dogs/fifi_, _pets/dogs/rover_: content.
+ * _pets/cats_, _pets/cats/mumu_, _pets/cats/ceefer_: similar.
+
+When rendered, _pets_ [contains](http://www.willthompson.co.uk/tmp/ikiwiki-nested-inline/output/pets/) the content from _pets/dogs_ and _pets/cats_, but not the pages inlined into them.  However, the subpages [correctly](http://www.willthompson.co.uk/tmp/ikiwiki-nested-inline/output/pets/dogs/) [include](http://www.willthompson.co.uk/tmp/ikiwiki-nested-inline/output/pets/cats/) their own children.
+
+This used to work in at least ikiwiki 1.45.  I stepped through `preprocess_inline`, but couldn't see why this wasn't working.