Misalignment of hanging text of really long section names in the ToC

[ajeanmahoney]

Describe the issue

The hanging indent of really long section names in the Table of Contents is inconsistent in all outputs.

In the text output, the hanging indent of the first-level section name aligns with the hanging indent of the second-level name, but it is correctly aligned in the HTML and PDF outputs. However, in the HTML and PDF outputs, the hanging text in the second- and third-level section names is not indented enough in the ToC. That is, it aligns under the section number rather than the section name text.

Current text output:

   2.  Conventions Used in This Document That I'm Trying to Make
           Really Long so I Can See the Indentation in the Table of
           Contents in the TXT Output
     2.1.  Terminology: A Gratuitously Long Title for Such a Short
           Section Plus Some More Words to Make It Longer
       2.1.1.  A Third-Level Section Heading Used in This Document
               That I'm Trying to Make Really Long so I Can See the
               Indentation in the Table of Contents in the TXT Output

Current HTML and PDF outputs:

   2.  Conventions Used in This Document That I'm Trying to Make
       Really Long so I Can See the Indentation in the Table of
       Contents in the TXT Output
     2.1.  Terminology: A Gratuitously Long Title for Such a Short
       Section Plus Some More Words to Make It Longer
       2.1.1.  A Third-Level Section Heading Used in This Document
         That I'm Trying to Make Really Long so I Can See the
         Indentation in the Table of Contents in the TXT Output

Desired output:

   2.  Conventions Used in This Document That I'm Trying to Make
       Really Long so I Can See the Indentation in the Table of
       Contents in the TXT Output
     2.1.  Terminology: A Gratuitously Long Title for Such a Short
           Section Plus Some More Words to Make It Longer
       2.1.1.  A Third-Level Section Heading Used in This Document
               That I'm Trying to Make Really Long so I Can See the
               Indentation in the Table of Contents in the TXT Output

Files:

• https://www.rfc-editor.org/v3test/ToC-long-headings.xml
• https://www.rfc-editor.org/v3test/ToC-long-headings.pdf
• https://www.rfc-editor.org/v3test/ToC-long-headings.html
• https://www.rfc-editor.org/v3test/ToC-long-headings.txt

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