fix: Row Detail should also work with fixed grid height or w/o autoHeight

[ghiscoding]

• defining a fixed grid height and/or disabling resizer.autoHeight should expect the Row Detail to still work properly (it wasn't before this PR)
  • the resizer.autoHeight had a side effect of calling row invalidate after the resize and this side effect was in fact hiding the UI problems described above, which meant that in a few occasions, the Row Details weren't invalidated/redrawn properly
• also rewrite the pre/post templates to use native HTML code instead of HTML string, which is better for perf and also more secure without requiring any sanitization

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (3fbf4ba) to head (7b28641).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1540   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            8         8           
  Lines         1625      1621    -4     
  Branches       468       464    -4     
=========================================
- Hits          1625      1621    -4     

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