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9204836d70
If the Ruby on Rails grammar depends on HTML, but it isn't loaded, its syntax highlighting won't include HTMl tokens. If we later load HTML, we should update any buffer with the Rails grammar to reflect the change. This commit changes grammars to memoize their initial rule and repository. If an included grammar is added or removed, we clear the memoized rules and emit a 'grammar-updated' event. Any tokenized buffer that points to this grammar can then retokenize to reflect the newly available/unavailable included grammar.