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The "Comment Selection" include the first line after the selection
When using "Comment Selection" or "Uncomment Selection" commands in a shader file from Visual Studio from the menu Edit > Advanced or with the Ctrl+K, Ctrl+C or Ctrl+K, Ctrl+U shortcuts, the line directly following the selection
(usually where the caret is located) is also commented/uncommented, which is inconsistent with standard Visual Studio behavior. (tested on 2008 Professional)