[issue37824] IDLE: Handle Shell input warnings properly.

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

To review: Serhiy reported 3 'IDLE' bugs: tripled DeprecationWarning (now joined by SyntaxWarning), printing to console (if available) instead of Shell, and an exit exception.

1. Codeop generates the tripicates; #40807 will fix that.
2. PR-15311 prints warnings to Shell, but I held off  pending some fix.  3. The exception (a duplicate report) was fixed on #35623.
4. PR-15500 stopped turning a SyntaxWarning into a SyntaxError.

Additional issues, semi-independent.
5. REPL prints warning after code, IDLE before
6. REPL prints 1 line, IDLE 4, but this is related to Shell warnings going to the console.  IDLE should use 1 and highlight.
7. Should IDLE extend scope of deduplication?  Yes with 4 lines, maybe not with 1 line.
8. REPL partially deduplicates within compound statement; see #40807.

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versions:  -Python 3.10

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