[Libreoffice-bugs] [Bug 142948] New: DOCX align centered to margin is incompatible between Word and Writer

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=142948

            Bug ID: 142948
           Summary: DOCX align centered to margin is incompatible between
                    Word and Writer
           Product: LibreOffice
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: rb.henschel at t-online.de

Created attachment 173021
  --> https://bugs.documentfoundation.org/attachment.cgi?id=173021&action=edit
Examples centered in Word

Open attached docx document in Word and in Writer. It has some shapes, which
are horizontal aligned centered to margin. The red line marks the center.
Compare the horizontal alignment between Word and Writer.

For most shape types, Word uses the bounding box, including fat strokes, shadow
and callout extensions, and aligns the bounding box center with the page text
area center.
For some shape types, Word uses the snap rectangle. That is the rectangle which
has the handles to resize the object. I have found "chord", "arc", "pie" and
"block arc", but there might exist more.
For some shape types, I do not see any rule, how Word centers the object, e.g.
the shape type "half frame". The document contains a rotated "half frame".

LibreOffice uses the snap rectangle to position the object centered.

How should we handle this incompatibility? Change "center" to "from" on import
and export? Or do nothing and inform the user, that this alignment type is
incompatible? Where? Help or Wiki? Any other ideas?

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