Created attachment 79964 [details]
screenshot where 2 extra points selected
Almost all shapes except of square and rectangle have 2 extra dots, one in upper-left corner and another in bottom-right.
Preparations: Tools->Options->LibreOffice->View, disable "Use Anti-aliasing"
Steps to reproduce:
0. Start Writer/Calc/Draw/Impress
1. Draw any shape except of square and rectangle, for example circle
Actually: shape has 2 extra dots 1-pixel size, one in upper-left corner and another in bottom-right
Expected: no mentioned above dots, only shape
2. Right mouse click on shape, select convert->to polygon. Press F8 if needed.
Now we see extra points selected.
Reproduced in 3.5.7 and 4.0.3 on Fedora (RFR) 64 bit
This bug is continuation of this: Bug 47544
*** This bug has been marked as a duplicate of bug 37559 ***