Created attachment 130946 [details]
Arrow head screenshot (left: PowerPoint 2007, right LO 188.8.131.52)
LibreOffice's Short Line Arrow has a different line width for the arrow head than for the line before the arrow, looking roughly like "====->".
Expected: The arrow head uses the same line width as the "tail" of the arrow ("====>").
Cf. screen shot; making the arrow wider, it becomes even more obvious.
Side remark/background: I stumbled over this when opening a PPTX document in LO as PowerPoint's open arrows ("--->") get imported as line arrows "--- >" which have a gab between the line and the ">". If the issue of this bug would be resolved, mapping PPTX's "open arrows" to LO's "Short Line Arrow" would give the same arrow type.
I would say this is a duplicate of bug 82760 as well. Thanks for reporting it anyway.
*** This bug has been marked as a duplicate of bug 82760 ***