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David Taylor
439efc7419
From time-to-time, variables may need to be renamed in core. To avoid breaking existing themes and plugins, this commit introduces a system to automatically rewrite old variable names to new ones. A list of renames is maintained in `stylesheets/variable-renames.json`, and is applied when CSS is compiled. This list also powers a stylelint rule which will automatically rewrite old names to new names in source code. Transformations apply to all core/theme/plugin code. For now, the stylelint rule/autofix applies to core only, but this will be extracted to `@discourse/lint-configs` in the near future. When a transformation is applied, it adds a trailing `/* automatically renamed --old to --new */` comment so that the behavior is understandable from the browser developer tools.