1 files changed, 19 insertions, 0 deletions
diff --git a/content_scripts/mode.coffee b/content_scripts/mode.coffee
index 508b1b2c..49da03e2 100644
--- a/content_scripts/mode.coffee
+++ b/content_scripts/mode.coffee
@@ -144,6 +144,25 @@ class Mode
         keyup: (event) =>
           if KeyboardUtils.isPrintable event then @stopBubblingAndFalse else @stopBubblingAndTrue
 
+    # if @options.suppressTrailingKeyEvents is set, then we suppress all key events until a subsquent
+    # (non-repeat) keydown or keypress.  In particular, the intention is to catch keyup events for keys which
+    # we have handled, but which otherwise might trigger page actions (if the page is listening for keyup
+    # events).
+    if @options.suppressTrailingKeyEvents
+      @onExit ->
+        handler = (event) ->
+          if event.repeat
+            false # Suppress event.
+          else
+            keyEventSuppressor.exit()
+            true # Do not suppress event.
+
+        keyEventSuppressor = new Mode
+          name: "suppress-trailing-key-events"
+          keydown: handler
+          keypress: handler
+          keyup: -> handlerStack.stopBubblingAndFalse
+
     Mode.modes.push @
     @setIndicator()
     @logModes()