Fixes #0000893: Unable to suggest any item (link, article, topic)
Fixes #0000357: Form modification detector (it's php part) works strange
Merge of "in-portal/releases/5.0.3@13506" to "in-portal/branches/5.1.x@13544".
Merge of "in-portal/releases/5.0.2@13073" to "in-portal/branches/5.1.x@12657".
Reintegrate merge of "in-portal/releases/5.0.1@12617" to "in-portal/branches/5.1.x@12453".
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