Implement editorconfig serializer for naming style preferences (17.12) #76376
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The serializer is required when saving naming style preferences specified in Tools > Options to solution fallback options. The option was throwing NotSupportedException, which was reported via NFW but for some reason does not appear in telemetry data (TBD why).
In order to preserve ordering of the naming style rules as specified in Tools > Options settings we introduce a new editor option
dotnet_naming_rule.{rule-name}.priority. The highest priority is 0, which is the default. When saving VS options we generate priorities 0..N-1 where N is the number of rules. This causes VS option order to be preserved when the preferences are deserialized from fallback options.Note that if any naming style is set in .editorconfig file, all naming style settings in VS options are ignored. This behavior is consistent with VS 2019.
Fixes https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2297536