ITagger<T>.GetTags Method (NormalizedSnapshotSpanCollection)
Gets all the tags that intersect the specified spans.
Assembly: Microsoft.VisualStudio.Text.Logic (in Microsoft.VisualStudio.Text.Logic.dll)
Two spans intersect if they have positions in common, or if the end of one span coincides with the start of the other span, and neither is empty.
Taggers are not required to return their tags in any specific order. The recommended way to implement this method is by using generators (yield return), which allows lazy evaluation of the entire tagging stack.