[clang] [clang-format] Add MainIncludeChar option. (PR #78752)

[Björn Schäpers via cfe-commits]

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+// Test the combination of regrouped include directives, via regexes and
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HazardyKnusperkeks wrote:

I've never run anything but the unit tests. I'd remove these, but I have no strong opinion on that matter.

https://github.com/llvm/llvm-project/pull/78752