https://bz.apache.org/bugzilla/show_bug.cgi?id=69784

            Bug ID: 69784
           Summary: Double borders and borders over hanging PPTX2PNG
           Product: POI
           Version: 5.4.2-FINAL
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XSLF
          Assignee: dev@poi.apache.org
          Reporter: justin.thomas.wil...@gmail.com
  Target Milestone: ---

Created attachment 40084
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=40084&action=edit
Table output in slide.png

When using PPTX2PNG renderer, all existing tables in the slide template have
their inside borders doubled and the left, right and bottom end of the borders
over hang the last border crossed. 

https://stackoverflow.com/questions/79414248/apache-poi-ppt-to-image-broken-table-border

This is not my post but their image matches what I am running into. If you look
at their response image and the table within, that is what the renderer does to
all tables added normally before the PPTX2PNG renderer turns the slide to a
PNG. I am able to get around the double borders by only adding the bottom and
right border of each cell within a for loop except for the first column and top
row of course which needs the left and top borders. 

Zoom in on the image and you will also see that the left, right and bottom ends
of borders are over hanging the last border they cross. Not the top for what
ever reason. I cannot find a way around this issue.

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