[Docutils-develop] [docutils:bugs] Re: #444 Table column width rounding can result in uneven column widths

[Günter M. <mi...@us...>]

Thank you for the report.

Unless the problem is fixed, there is a workaround:

Tables works fine with Docutils 0.18.1 and `rst2html5.py` "out of the box",
because of the new default (colwidths-auto).
https://docutils.sourceforge.io/RELEASE-NOTES.html#release-0-18-2021-10-26

With "html4css1" and "latex", you can use the config setting
`table-style: colwidths-auto` or command line option
`--table-style=colwidth-auto` (for the complete document) 
or ``:widths: auto`` on individual tables.
This should also work for Docutils 0.17.

Compare:

~~~
.. table::
   :width: 100%
   :widths: auto
   
   ===  ===  ===  ===  ===  ===  ===  ===
    x    x    x    x    x    x    x    x 
   ===  ===  ===  ===  ===  ===  ===  ===

.. table::
   :width: 100%
   :widths: grid
   
   ===  ===  ===  ===  ===  ===  ===  ===
    x    x    x    x    x    x    x    x 
   ===  ===  ===  ===  ===  ===  ===  ===
~~~


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** [bugs:#444] Table column width rounding can result in uneven column widths**

**Status:** open
**Created:** Thu Feb 10, 2022 06:13 AM UTC by Alex Forencich
**Last Updated:** Thu Feb 10, 2022 06:18 AM UTC
**Owner:** nobody


In the HTML generated for a table with 8 equal-width columns, the column widths in the generated colgroups are all rounded up from 12.5% to 13%, resulting in the last column being much too narrow (0.5 * 7 = 3.5, 3.5/12.5 = 0.28, so the accumulated error is almost 30%).  The fix would be to revise the rounding in `depart_colspec` in `_html_base.py` to produce at least one decimal place, instead of rounding to the nearest integer.


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