Fix 5706 Block Positioning when nesting and blocks span columns

[NealGooch]

📑 Summary

Block diagrams positioning goes wrong when nesting blocks and blocks span columns

Resolves #5706

📏 Design Decisions

Fix

📋 Tasks

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 4.47%. Comparing base (bc2cc61) to head (8456faa).

Files with missing lines	Patch %	Lines
packages/mermaid/src/diagrams/block/layout.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #6119   +/-   ##
=======================================
  Coverage     4.47%   4.47%           
=======================================
  Files          383     383           
  Lines        54142   54142           
  Branches       596     596           
=======================================
  Hits          2425    2425           
  Misses       51717   51717           

Flag	Coverage Δ
unit	4.47% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/mermaid/src/diagrams/block/layout.ts	0.00% <0.00%> (ø)

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