Please reopen:

This section specifies twice about how any other value (including false) disables the setting. It does this first in the option table with the description "Never add spaces between parentheses" for "false (or any other value)".

Then immediately after the table: "If you omit this rule or use a value other than control_flow_statements, expressions, or type_casts, the setting is not applied."

I think the intent for a false value is for the spaces between parentheses to be ignored, meaning new spaces are not added, but neither are existing spaces removed. The "Never add spaces" description and the "setting is not applied" statement below it might technically mean the same thing, but the wording is ambiguous and potentially redundant.

But both descriptions don't address the underlying issue: the documentation does not specify a default option value. It appears to be the only formatting option that doesn't have one (37 option names, 36 default values). It seems like the default could be false or maybe ignore, but shouldn't it at least be something?

@tmat Can you help me figure out the default value for csharp_space_between_parentheses? I found https://github.com/dotnet/roslyn/blob/ff40252939f4d51525149f80b2ae0baf6df93bb1/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/Formatting/CSharpFormattingOptions2.cs#L111 and https://github.com/dotnet/roslyn/blob/ff40252939f4d51525149f80b2ae0baf6df93bb1/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/Formatting/CSharpSyntaxFormattingOptions.cs#L23-L28, but can't quite figure out what it means.

@gewarren Supported values are listed in https://github.com/dotnet/roslyn/blob/f060a3f3c08ed0752a94d75972d5477927a003ab/src/Workspaces/SharedUtilitiesAndExtensions/Compiler/CSharp/Formatting/CSharpFormattingOptions2.cs#L24

@tmat Thank you, but I'm trying to figure out what the default value is.