Fix #533, add support overlapped mergecells

[match-meng]

PR Details

Description

Related Issue

Motivation and Context

How Has This Been Tested

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-io]

Codecov Report

Merging #536 into master will increase coverage by 0.2%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #536     +/-   ##
=========================================
+ Coverage   96.47%   96.67%   +0.2%     
=========================================
  Files          28       28             
  Lines        5729     5751     +22     
=========================================
+ Hits         5527     5560     +33     
+ Misses        110      104      -6     
+ Partials       92       87      -5

Impacted Files	Coverage Δ
xmlWorksheet.go	100% <ø> (ø)	⬆️
adjust.go	96.29% <ø> (-0.05%)	⬇️
cellmerged.go	100% <100%> (+3.92%)	⬆️
cell.go	94.95% <100%> (+2.37%)	⬆️

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[xuri]

LGTM, thank you.