Backports to 1.13

[dkarrasch]

• In-place multiplication of Diagonal with OffsetMatrix should throw #1526

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.99%. Comparing base (31f3947) to head (cdee36a).
⚠️ Report is 1 commits behind head on release-1.13.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.13    #1528   +/-   ##
=============================================
  Coverage         93.99%   93.99%           
=============================================
  Files                34       34           
  Lines             15932    15934    +2     
=============================================
+ Hits              14975    14977    +2     
  Misses              957      957           

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