log color / thickness selected for curves #450

Job	Run time
build-macos-brew-Qt6 (clang-9)	3m 7s
build-macos-brew (clang-9)	2m 51s
build-macos-no-brew (clang-9)	5m 30s
build-linux-Qt6 (gcc-9)	7m 18s
build-macos-no-brew-Qt6 (clang-9)	5m 16s
build-windows-mingw (5.15.*)	10m 31s
build-windows-mingw-Qt6 (6.3.0, qtmultimedia qt5compat)	12m 3s
build-windows-vs (5.15.*)	8m 58s
build-windows-vs-Qt6 (6.3.0, qtmultimedia qt5compat)	13m 28s
build-linux (gcc-9)	7m 21s
	1h 16m 23s

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