Definition list spacing

[rbfrank]

Fix description list wrapped line indentation to use dindent option

Summary

Modified description list (.dl) processing to make wrapped continuation line indentation configurable via the dindent option, replacing the hardcoded 2-space indent.

Changes

Text Output (ppgen.py)

• wrap_def() method (lines 7960-7977): Changed hanging indent calculation to use dindent when specified
• emit_paragraph() method (lines 7865-7872): Applied same logic for paragraph/combining mode
• When dindent > 0: Uses dindent value as the hanging indent amount
• When dindent = 0 (default): Maintains backward-compatible 2-space hanging indent

HTML Output (ppgen.py)

• begin_dl() method (lines 11992-12063): Updated CSS generation for hanging indents
• Fixed issue where dindent was shifting the entire definition (including first line) to the right
• Now matches text output: first line position stays constant, only wrapped continuation lines are affected
• Applies to both float=y and float=n modes

Leading Spaces in Descriptions

• Fixed bug where leading spaces after | in descriptions weren't being converted to CSS in HTML output
• Added CSS class generation (.dd_inN) for indent amounts
• Classes now properly applied to both <dd> tags (style=d) and <p> tags (style=p)
• Leading spaces stripped from HTML content and represented via CSS padding

Behavior

• Backward compatible: Default dindent=0 preserves existing 2-space hanging indent
• Configurable: Setting dindent=4 creates 4-space hanging indent for wrapped lines
• Consistent: Text and HTML output now match visually
• First line stable: Changing dindent only affects continuation lines, not first line position

Testing

Verified with multiple test cases:

• Default dindent=0 maintains backward compatibility
• Custom values (dindent=4, dindent=6) work correctly
• Both combining (combine=y) and non-combining modes tested
• Both hang=y and hang=n modes work as expected
• HTML and text output match