Feature: `hscroll_indicator` (#753) #909

Job	Run time
documentation	21m 26s
Tests (Linux GCC, ubuntu-latest, gcc, gcov)	7m 9s
Tests (Linux Clang, ubuntu-latest, llvm, llvm-cov gcov)	8m 24s
Tests (MacOS clang, macos-latest, llvm, llvm-cov gcov)	16m 6s
Tests (Windows MSVC, windows-latest, cl)	32m 49s
Create release	0s
Build packages	0s
	1h 25m 54s

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