[clang] [clang-format] allow short function body on a single line (PR #151428)

[Lidong Yan via cfe-commits]

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@@ -510,27 +515,50 @@ class LineJoiner {
 
     // Try to merge a function block with left brace wrapped.
     if (NextLine.First->is(TT_FunctionLBrace) &&
-        Style.BraceWrapping.AfterFunction) {
+        (Style.BraceWrapping.AfterFunction ||
+         Style.AllowShortBlocksOnASingleLine >= FormatStyle::SBS_Empty)) {
       if (NextLine.Last->is(TT_LineComment))
         return 0;
 
       // Check for Limit <= 2 to account for the " {".
       if (Limit <= 2 || (Style.ColumnLimit == 0 && containsMustBreak(TheLine)))
-        return 0;
+        if (Style.BraceWrapping.AfterFunction)
+          return 0;
       Limit -= 2;
 
       unsigned MergedLines = 0;
+      const bool NextShortBlock = NextLine.First == NextLine.Last &&
+                                  I + 3 != E && I[3]->First->is(tok::r_brace);
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brandb97 wrote:

I mean these three failed tests in [CI Checks / Build and Test Linux (pull_request)]
  lldb-api:
    - lldb-api.functionalities/data-formatter/data-formatter-stl/generic/forward_list/TestDataFormatterGenericForwardList.py
    - lldb-api.functionalities/data-formatter/data-formatter-stl/generic/list/TestDataFormatterGenericList.py
    - lldb-api.functionalities/data-formatter/data-formatter-stl/generic/list/loop/TestDataFormatterGenericListLoop.py
    
But since I need to rewrite some code again, maybe these failed tests would disappear in next commit.

https://github.com/llvm/llvm-project/pull/151428