rendering of markdown code blocks lacked \n

[BertKoor]

fix #4841

Comment in the code after a fix for #4402:

The markdown convert adds newlines, but not in a documented way. Safest to ignore them.

There was a report in the forum of a rather long story of multiple paragraphs in a note being completely rendered on one single line. I traced back the cause to this strtr($html, ["\n" => '']) function.

Indented code blocks in markdown get rendered as <pre><code></code></pre>, so newlines being kept in tact are then very relevant.

I have chosen to remove only the last newline. That one is indeed redundant, and this then reduces impact on existing test cases.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.20%. Comparing base (2b3a3e6) to head (237dfae).
⚠️ Report is 120 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #5295   +/-   ##
=========================================
  Coverage     35.20%   35.20%           
  Complexity    11236    11236           
=========================================
  Files          1159     1159           
  Lines         48108    48108           
=========================================
  Hits          16937    16937           
  Misses        31171    31171           

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