[clang] [clang-format] add an option to insert a space only for non-code block empty braces, not for empty parentheses (PR #93634)

[Kohei Asano via cfe-commits]

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@@ -1864,7 +1894,11 @@ FormatStyle getWebKitStyle() {
   Style.ObjCSpaceAfterProperty = true;
   Style.PointerAlignment = FormatStyle::PAS_Left;
   Style.SpaceBeforeCpp11BracedList = true;
-  Style.SpaceInEmptyBlock = true;
+  Style.SpaceInEmptyBraces = FormatStyle::SIEBO_Custom;
+  Style.SpaceInEmptyBracesOptions.Block = true;
+  Style.SpaceInEmptyBracesOptions.InitList = true;
+  Style.SpacesInParensOptions.InEmptyParentheses = false;
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khei4 wrote:

I believe this matches, but it might be miss-leading, [check-webkit-style 
](https://github.com/WebKit/WebKit/blob/b6db305ef703967e6727c0120b7e46305b02b008/Tools/Scripts/webkitpy/style/checkers/cpp_unittest.py#L2384-L2386)script
 seems like to check whatever empty braces have space. To double check, I will 
ask in WebKit slack also.

https://github.com/llvm/llvm-project/pull/93634
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