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This patch fixes an issue where an escaped asterisk character is being
treated as a universal selector. The problem was that \* and * were
represented as g_star_atom (the '*' character) in selector matching.

To differentiate between the two, we picked a different way to represent
universal selectors. The local name of a universal selector becomes
g_null_atom instead of g_star_atom. This way, \* and * will no longer
clash.

Bug: 682747
Change-Id: Ied14b468c8bfae6ed1022a565f4f46cea4c556a8
Reviewed-on: https://chromium-review.googlesource.com/765626Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521556}