DOCX: MS Word with uncorrect style converting of font size "12pt" based on BIRT produced DOCX-documents

[speckyspooky]

Based on the discussion #1868 I started a research of the font-size styling topic to test different situations
what the font-size result will be given in compare of HTML -> (PDF ->) DOCX.

The styling from HTML to PDF is ok but a special situation with the font-size "12pt" cause a wrong style conversion in DOCX-documents.

The problem is that the HTML-content of the BIRT-elements "text", "dynamic text", "data" will not parsed into full supported DOCX-elements. Instead of a full parser the archive-/intermediate-format MHT(ML) will be used. These files embedded like external documents into the DOCX and will be converted through Word into the DOCX-elements.

example of the internal DOCX-structure with MHT-files created by BIRT

And there exists a kind of standard error on MS Word side because the font size "12pt" will be converted in every case into "10pt".
This topic is given at the HTML-tags "div" & "span" but also the HTML4.0-element font is not converted correctly for result size "12pt".
(BIRT produce the DOCX-Version: WordProcessingML, Version 2016)

I tried to replace the "div"-tag with the "p"-tag (paragraph). But the converting of Word is not the same for these both elements
so we would get side effects of styling. In special cases the styling of a p-tag will override the style of following elements.

Normally the best way would be to implements a DOCX-parser to avoid MHT-files but for that large efforts are needed to get it.
(Note: DOC-files from BIRT 4.6 was created correctly, for that file format a kind of HTML-parser is implemented but cannot used for DOCX.)

The smallest workaround is to use another font-size instead of "12pt" to get a better result.
So I will provide a PR that the font-size will be changed from "12pt" to "12.5pt".
I know this isn't the same font-size and therefore I call it workaround. But it is better like the currenty situation.

Note: The behavior of #1868 was not reproducable on my side.

Example 01 of wrong converting

Example 02 of wrong converting

[speckyspooky]

The test results of the new solution are tested.
The following screens provide the new result for the font-size for DOCX-documents.

Example 01

Example 02

The PR with the solution is added with #1906