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    <p><strong>Revised Answer:</strong></p> <p>Ah, I see. I interpreted your question thinking that you were referring to completion triggering via typing, not from the explicit command. If you enable "show whitespace" for the C# editor, you can see what we do here: when you trigger the "show completion" command, we explicitly realize the whitespace so you're no longer floating around in virtual space. You should probably do this as well. (Alternatively, you could detect the scenario and fix it up on the first typing by adjusting your ApplicableTo span, but that's probably not worth the trouble.)</p> <p>You can get the whitespace that should be inserted from IEditorOperations. So MEF import an IEditorOperationsFactoryService, and then do:</p> <pre><code>var editorOperations = editorOperationsFactoryService.GetEditorOperations(textView); var whitespace = editorOperations.GetWhitespaceForVirtualSpace(textView.Caret.Position.VirtualBufferPosition); if (whitespace.Length != 0) { textView.TextBuffer.Insert(textView.Caret.Position.BufferPosition, whitespace); } </code></pre> <p>(Funny aside: as I answered this, I was curious to see how we handled this in the Roslyn C# and VB editors. The answer was "not", but filtering still worked by pure luck later in the code.)</p> <p><strong>Original Answer:</strong></p> <p>I suspect by your description of the problem that you are implementing your completion like this: you know a character is about to be typed (either via a keyboard filter or <code>IOleCommandTarget</code>) and you trigger an ICompletionSession, where the tracking span is an empty span on the current caret position.</p> <p>The best approach to fixing this is to not trigger the session before the key is pressed and goes into the editor, but rather after it. This is what we do in the Roslyn implementation for C# and VB completion. Then, when you are in your AugmentCompletionSession call and creating your CompletionSet, compute the "applicable to" span which consists of the non-whitespace characters around your caret. The easiest way to compute this might just be to call <code>GetWordExtent</code> from the text structure navigator.</p> <p>This allows for other scenarios to work right. Consider scenarios where the user types C, presses escape, and then continues to type your identifier. If you want to trigger completion again, you'd have to do the math to ensure that the "C" is counted as part of your span anyways.</p>
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    1. COThank you for your answer. Calling StartSesion() actually takes place **after** the key press. I first call `Next.Exec(pguidCmdGroup, nCmdID, nCmdexecopt, pvaIn, pvaOut)` and then check for `VSConstants.VSStd2KCmdID.AUTOCOMPLETE` yet it happens again. VS adds those extra tabs after session is started and on the first key press (which again is after Next.Exec(...))
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    2. COAlso `AugmentCompletionSession()` gets called only once at the start of the session. Caret at that time is on virtual spaces. There is no point in searching for word extent.
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    3. COanother also: please see my edit in the question
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