Owen Voorhees 69b513afaf [Diagnostics] Updated (experimental) diagnostic printing style (#30027) ...

* [Diagnostics] Experimental diagnostic printing updates

This new style directly annotates small snippets of code with
error messages, highlights and fix-its. It also uses color more
effectively to highlight important segments.

* [Diagnostics] Stage educational notes and experimental formatting behind separate frontend flags

educational notes -> -enable-educational-notes
formatting -> -enable-experimental-diagnostic-formatting

* [Diagnostics] Refactor expensive line lookups in diag formatting

* [Diagnostics] Refactor some PrintingDiagnosticConsumer code into a flush method

* [Diag-Experimental-Formatting] Custom formatting for Xcode editor placeholders

* [Diag-Experimental-Formatting] Better and more consistent textual description of fix its

* [Diags-Experimental-Formatting] Handle lines with tab characters correctly when rendering highlights and messages

Tabs are converted to 2 spaces for display purposes.

* [Diag-Experimental-Formatting] Refactor byte-to-column mapping for efficiency

* [Diag-Experimental-Formatting] Fix line number indent calculation

* [Diag-Experimental-Formatting] Include indicators of insertions and deletions in the highlight line

Inserts are underlined by green '+' chars, deletions by red '-' chars.

* [Diag-Experimental-Formatting] Change color of indicator arrow for non-ASCII anchored messages
* [Diag-experimental-formatting] Make tests less sensitive to line numbering

* [Diag-Experimental-Formatting] Update tests to allow windows path separators

* [Diag-Experimental-Formatting] Bug fixes for the integrated REPL

2020-03-03 08:48:32 -08:00

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