RavieDragon SLSGC
I saw this in one or two spots recently, but no real clean bug report, so I am writing this.
Note, that I've done this often in my 10 years of working in SL, and I don't recall this always happening but behavior seems to have changed recently.
When you link 2 things together, and then attempt to corner stretch a single object in the linkset, it acts like "Stretch Both Sides" is enabled, when it's not. It only does this on corner stretch (not one-dimensional stretches) and only when part of a linkset.
You can see me demonstrate this here: https://gyazo.com/b5c2a54823ccf28dcbc3fc127a847035
Steps to reproduce:
  1. Create two cubes.
  2. Link the two cubes.
  3. Right click Edit the linkset.
  4. Click Edit Linked
  5. Click the child prim
  6. Click Stretch
  7. Attempt to corner stretch the prim, observe bug occurs.
  8. Attempt to one-dimension stretch the prim, observe bug does not occur.
  9. Unlink the cube, and then repeat steps 6, 7, and 8. For step 7 and 8, the bug does not occur in either case when unlinked.