I found a mistake in the patch for bug 1555951, which has broken selecting multiple items in a `<tree>` by holding Ctrl and clicking.
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I found a mistake in the patch for bug 1555951, which has broken selecting multiple items in a `<tree>` by holding Ctrl and clicking. Mistake is here: https://hg.mozilla.org/mozilla-central/rev/7d0ccb92fae0#l6.41