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    <p>Essentially, you'll have to remember the state yourself. Most VS language services keep a state cookie for the beginning of each line that they update on text change.</p> <p>At any point, getting classifications (through either a classifier aggregator or tag aggregator) will always result into a call into the current classifiers/taggers, so it won't be returning any type of cached state (or the "last" classifications returned). The editor doesn't really cache this information, and just acts as a dumb pass-through for the information your classifier provides to the visible lines being formatted.</p> <p>Also, If you do it from a classifier (provided by either an IClassifierProvider or ITaggerProvider), you are setting yourself up for some nasty recursion, especially if your classifier responds to <code>GetClassificationSpans</code> by calling into the aggregator (which then calls back into your classifier for some earlier text, etc.). If your classifier <em>needs</em> to consume other classifications to work correctly (and not its own classifications), the only safe way to write that is to:</p> <ol> <li>Implement your "classifier" as an <code>ITagger&lt;IClassificationTag&gt;</code>, and provide it from an <code>IViewTaggerProvider</code>.</li> <li>Grab an <code>ITagAggregator&lt;IClassificationTag&gt;</code> from an <code>IBufferTagAggregatorFactoryService</code>, but only once.</li> <li>Implement <code>IDisposable</code> on your tagger and dispose the tag aggregator in <code>Dispose()</code>.</li> </ol>
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    1. COthx for the answer! about the state cookies: is there any built-in infrastructure for that or shall I just store them in my own model?
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    2. COThere was in the old interfaces (`IVsColorizer`), but not in the new ones, so you'll have to write your own model. Let me know if you run into any problems, though, as I had to write such a model when shimming these old `IVsColorizer`s so they'd work with classification.
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