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Refactor `gui/journal` text editor to dedicated `TextArea` widget #5087

Job	Run time
lint / lint	27s
docs / Build linux64	1m 3s
test / Windows MSVC / Build win64	4m 30s
test / Linux gcc-12 / Build linux64	1m 24s
test / Linux gcc-10 / Build linux64	1m 26s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	33s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	51s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	43s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	38s
	11m 35s

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