CppEditor: copy snapshot before FunctionDeclDefLink change calculation.
FunctionDeclDefLink::changes is called from CPPEditorWidget::updateFunctionDeclDefLinkNow() where it receives the snapshot by reference from the semantic info. The semantic info is recalculated in a/the future, so it might change the snapshot or its documents while it's still being used by the decl/def link finder. So, this patch takes a copy of all relevant semantic info (snapshot and document) before starting to calculate the changes. Change-Id: I78244a4ca8149233403b3c35ee05a2d4ed4b2770 Reviewed-by: Nikolai Kosjar <firstname.lastname@example.org>
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