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Added new slider widget to `devel/hello-world` #5495

Job	Run time
lint / lint	20s
docs / Build linux64	1m 20s
test / Windows MSVC / Build win64	5m 43s
test / Linux gcc-10 / Build linux64	1m 17s
test / Linux gcc-12 / Build linux64	2m 40s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	36s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	47s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	57s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	53s
	14m 33s

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