[llvm-bugs] [Bug 40459] New: clang-format over-indents inner initialiser lists

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https://bugs.llvm.org/show_bug.cgi?id=40459

            Bug ID: 40459
           Summary: clang-format over-indents inner initialiser lists
           Product: clang
           Version: 7.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: john.j.beard at gmail.com
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

Using a format including the following (clang-format version 7.0.1
(tags/RELEASE_701/final)

BasedOnStyle: LLVM
BreakBeforeBraces: Allman
ContinuationIndentWidth: 8
Cpp11BracedListStyle: false
IndentWidth: 4

Try to format the following code:

std::vector<std::vector<int>> data{
    {
        42, // The Answer
    },
};

The above is how I expect it to look, considering that
`Cpp11BracedListStyle` is set to `false`, so it should use the block
indent (4), not the continuation indent (8). From the clang-format
docs [1], if this is `true`:

> "Important differences: - No spaces inside the braced list. - No line
> break before the closing brace. - Indentation with the continuation
> indent, not with the block indent."

So, I expected to see the "block indent" (4) used. However, what I
*actually* get is:

std::vector<std::vector<int>> data{
    { // indent 4 - OK
            42, // Indented by 4 + 8 (expected 4 + 4)
    },
};

As you can see, the "outer" initialiser list is indented by 4 (as
expected), but the "inner" list's elements are indented by a further
8, not 4.

Can be reproduced in the terminal with:

$ echo "std::vector<std::vector<int>data{{42,},};" | clang-format
-style="{BasedOnStyle: llvm, BreakBeforeBraces: Allman,
ContinuationIndentWidth: 8, Cpp11BracedListStyle: false, IndentWidth: 4}"

[1]: https://clang.llvm.org/docs/ClangFormatStyleOptions.html

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