I have the following table in an MS Word document - 3 rows, 4 columns, and some horizontal borders:
When I save this as PDF, I see some strange glitches with the borders:
Note that whether or not the glitches appear seems to depend on the application I use to view the PDF file, and also the zoom level. Adobe Acrobat Reader seems to be the worst offender, in other PDF viewers (Google Chrome, MS Edge, PDF XChange Editor) the glitches generally don't appear, and do only if I zoom in over 200%.
It seems that the border is rendered in PDF with multiple shape objects (on for each column, plus one for each column boundary) rather than a single shape object spanning the width of the entire row:
Is there any way to avoid this problem? Is there any way to get the PDF border rendered with a single shape object?