Fix/floating repeated size request

[higorprado]

Summary

• Fix a floating request_size_once() case where a repeated same-size request could be dropped after a stale commit.
• Skip redundant floating configure requests when the requested concrete size already matches the committed window size.
• Preserve interactive-move behavior (no regression).

Behavior Changes

• tests::floating::repeated_size_request:
  • before: last same-size request after commit could produce no configure
  • after: configure is re-sent correctly
• tests::floating::resize_to_same_size:
  • before: redundant configure could be sent even when size already matched
  • after: no configure is sent

Validation

• Floating test module passes, including:
  • repeated_size_request
  • resize_to_same_size
  • resize_to_different_then_same
  • resize_during_interactive_move_propagates_to_floating