https://bugs.documentfoundation.org/show_bug.cgi?id=117501
--- Comment #4 from Luke Deller <[email protected]> ---
Thanks you for finding this with your office-interoperability-tools work Xisco!
I think the underlying issue in attachment 90710 existed prior to commit
18cbb8fe699131a234355e1d00fa917fede6ac46.
This is about an old equation editing feature in Word described here:
https://blogs.msdn.microsoft.com/murrays/2018/01/23/microsoft-word-eq-field/
This example document uses such an "equation" to draw a superscript "x "
superimposed upon a subscript " a".
While LibreOffice does not in general handle this old equation syntax, it does
have a special case which can handle this example. It imports it as a "Combine
characters" field, a field intended for use with Asian languaes where several
character are arranged in a grid occupying the space of a single character.
This handling existed in the ww8(doc) filter inherited from StarOffice at the
beginning of our git history, and it was reused in the docx import for bug
66400 in commit 5342cd7533a51fd488de85565674ee01649ddcbc
The problem is that a "Combine characters" field containing 4 characters will
show each character at half of its normal height/width (quarter of the area).
However the Word equation does not reduce the size of the letters at all.
This problem was hidden in the example here, because there was direct
formatting placed upon the text prior to the field to double the font size.
This direct formatting was *not* applied to the field itself in Word, however
due to bug tdf#107035 this direct formatting was wrongly applied to the field
in LibreOffice. This resulted in the field's font size being doubled, which
exactly compensated for the problem I described in the previous paragraph.
Now that tdf#107035 is fixed, the problem in the equation import is no longer
hidden.
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