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Even before this fix, in 3.7.2, I no longer see the extra blank lines I reported in msg321135 either on Windows or macOS. I did still see the persistent and expanding indents reported in the opening post. I believe that this is what Raymond also referred to. The one I could reproduce are now gone. Hence, I close this.
Remaining newline and indent issues should be handled in other issues.
* I intend to review the initial PR for #32989 soon. I don't know what its effect might be on the user-visible result.
* Too short indents for open fences needs a new issue.
* Blank line before SyntaxError: interactive python does this.
>>> d={a:'a}
 File "<stdin>", line 1
 d={a:'a}
 ^
SyntaxError: EOL while scanning string literal
>>>
The ^ line is nearly blank. IDLE omits the line echo and ^ and adds a red highlight instead ... + an invisible indent on the next line (now too short). (It also color-codes the error message.)
>>> d={a:'a}<---red highlight to end of line...
 
SyntaxError: EOL while scanning string literal
>>>
Checking syntax first and skipping indent on error would give the following. I don't know how easy this would be.
>>> d={a:'a}<---red highlight to end of line...
SyntaxError: EOL while scanning string literal
>>>