fix interaction with modifiers

Author: jacekkopecky

lib/utils.coffee

@@ -1,3 +1,6 @@
+# copied from atom/atom-keymap src/helpers.coffee
+AtomModifierRegex = /(ctrl|alt|shift|cmd)$/
+
 module.exports =
   # Public: Determines if a string should be considered linewise or character
   #
@@ -12,3 +15,7 @@ module.exports =
       'linewise'
     else
       'character'
+
+  # copied and simplified from atom/atom-keymap src/helpers.coffee
+  isAtomModifier: (keystroke) ->
+    AtomModifierRegex.test(keystroke)

lib/vim-state.coffee

@@ -38,6 +38,8 @@ class VimState
 
     @subscriptions.add atom.keymaps.onDidFailToMatchBinding (e) =>
       return unless e.keyboardEventTarget is @editorElement
+      return if Utils.isAtomModifier(e.keystrokes)
+      
       atom.keymaps.cancelPendingState()
       if @mode is 'operator-pending'
         @resetCommandMode()