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In situations like code completion, braces matching and similar the features needs as much accurate parse tree as possible very fast. This can be achieved by implementing an incremental HTML syntax analyzer, resp. parser. The analyzer holds a structures of the file in memory and listens on lexer's TokenHierarchyListener. If it is safe to reparse just a part of the document it will be done otherwise the whole document will be parsed. The model is always in sync with the document after the document is unlocked.
this doesn't seem to be a priority