Highlights reconstruction: allow multi-instanciation #987

Job	Run time
Win64.UCRT64.skiptest.Debug.Ninja	13m 55s
Win64.UCRT64.nofeatures.Debug.Ninja	21m 34s
Win64.UCRT64.skiptest.Release.Ninja	14m 15s
Linux.noble.GNU14.skiptest.Debug.Ninja	4m 41s
Win64.UCRT64.nofeatures.Release.Ninja	21m 49s
Linux.noble.GNU14.nofeatures.Debug.Ninja	4m 9s
macOS.${{ matrix.compiler.compiler }}.${{ matrix.build.xcode }}.${{ matrix.target }}.${{ matrix.btype }}.${{ matrix.generator }}	0s
Linux.noble.GNU14.skiptest.Release.Ninja	5m 31s
Linux.noble.GNU14.nofeatures.Release.Ninja	5m 17s
Linux.noble.LLVM16.skiptest.Debug.Ninja	5m 38s
Linux.noble.LLVM16.nofeatures.Debug.Ninja	4m 51s
Linux.noble.LLVM16.skiptest.Release.Ninja	6m 20s
Linux.noble.LLVM16.nofeatures.Release.Ninja	5m 33s
	1h 53m 33s

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