DPL: investigate increase in displacement after auto detection to disallow 1-site gaps #6746
Description
Describe the bug
After merging PR #6718, some private designs had a increase in the displacement in the detailed placement stage. However, the 1-site gaps were avoided even without the disallow 1-site gaps flags, so it's possible that DPL is making unnecessary movements to avoid 1-site gaps.
A possible reason for that is that the placement padding might be considered when avoiding 1-site gaps, which is too pessimistic.
Expected Behavior
The displacement should not increase that much, ideally not changing at all when comparing with previous versions of OpenROAD.
Environment
Secure-CITo Reproduce
Internal testcase.
Relevant log output
Screenshots
No response
Additional Context
No response