[dkulyk]

Description

Font::BASELINE_SUPERSCRIPT is 300000 and BASELINE_SUBSCRIPT is -250000. The baseline
attribute is written in thousandths of a percent, so those ask for a 300% raise and a 250% drop and
the character lands on a line of its own.

before	after

30000 and -25000 are what 0.9.0 wrote, before the constants replaced the hard-coded values in
ec4700e, and what LibreOffice uses
for the same thing: oox/source/drawingml/textcharacterpropertiescontext.cxx maps
<w:vertAlign w:val="superscript"/> to baseline = 30000 and subscript to -25000. On import it
reads CharEscapement = baseline / 1000 and treats it as a percentage, which is why 300000 renders
as a 300% raise rather than being ignored.

Note this is not a schema violation -- baseline is ST_Percentage, unbounded in
tests/resources/schema/ecma-376/dml-main.xsd, and a slide carrying 300000 validates. The value
is simply ten times too large.

.odp is unaffected: the ODPresentation Writer does not write style:text-position at all, so
superscript is dropped there whatever the constant says. Separate matter.

Fixes #997

Checklist:

• My CI is 🟢

The unit tests pass, 1123 tests and 9172 assertions. The seven PHP Static Analysis jobs fail on master itself since phpoffice/common 1.1.0. PHPOffice/Common#64 dropped the <\DOMElement> from XMLReader::getElements()'s @return \DOMNodeList, so a node it yields is now inferred as DOMNode -- 18 errors, all in Reader/PowerPoint2007.php, none from this branch. git checkout master && composer update phpoffice/common && vendor/bin/phpstan analyse reproduces them.

• I have covered by unit tests my new code (check build/coverage for coverage report)

The ten assertions in PptSlidesTest and PptChartsTest that pinned the written attribute now pin the corrected value.

• I have updated the documentation to describe the changes

docs/usage/styles.md carried the old values and called the unit a percentage.

• I have updated the changelog

docs/changes/1.3.0.md.

[coveralls]

coverage: 94.091%. remained the same — sapientpro:fix/baseline-superscript-scale into PHPOffice:master