Simplify find-mode exit event.

Previously, we were transferring a "transferable event" from the HUD UI
component to the content script (when find mode exits).

In addition to being unnecessary, this was triggering a warning in the
console because we were reading *all* of the events keys, including one
which triggers a "this is being deprecated" warning.

The approach here is simpler, transfers less data and avoids triggering
the warning.

2 files changed, 6 insertions, 10 deletions

diff --git a/content_scripts/hud.coffee b/content_scripts/hud.coffee
index 4ba8557c..0d3a6f95 100644
--- a/content_scripts/hud.coffee
+++ b/content_scripts/hud.coffee
@@ -53,7 +53,8 @@ HUD =
       else
         @tween.fade 0, 150, => @hide true, updateIndicator
 
-  hideFindMode: (data) ->
+  # These parameters describe the reason find mode is exiting, and come from the HUD UI component.
+  hideFindMode: ({exitEventIsEnter, exitEventIsEscape}) ->
     @findMode.checkReturnToViewPort()
 
     # An element won't receive a focus event if the search landed on it while we were in the HUD iframe. To
@@ -65,13 +66,11 @@ HUD =
     document.activeElement?.blur()
     focusNode?.focus()
 
-    {event} = data
-
-    if event.keyCode == keyCodes.enter
+    if exitEventIsEnter
       handleEnterForFindMode()
       if FindMode.query.hasResults
         postExit = -> new PostFindMode
-    else if KeyboardUtils.isEscape event
+    else if exitEventIsEscape
       # We don't want FindMode to handle the click events that handleEscapeForFindMode can generate, so we
       # wait until the mode is closed before running it.
       postExit = handleEscapeForFindMode
diff --git a/pages/hud.coffee b/pages/hud.coffee
index fcc7b1dd..6eaa5f9c 100644
--- a/pages/hud.coffee
+++ b/pages/hud.coffee
@@ -15,18 +15,15 @@ setTextInInputElement = (inputElement, text) ->
 document.addEventListener "keydown", (event) ->
   inputElement = document.getElementById "hud-find-input"
   return unless inputElement? # Don't do anything if we're not in find mode.
-  transferrableEvent = {}
-  # NOTE(mrmr1993): We use for, not for own, here, since we want to access members from the Event prototype.
-  for key, value of event
-    transferrableEvent[key] = value if typeof value in ["number", "string"]
 
   if (event.keyCode in [keyCodes.backspace, keyCodes.deleteKey] and inputElement.textContent.length == 0) or
      event.keyCode == keyCodes.enter or KeyboardUtils.isEscape event
 
     UIComponentServer.postMessage
       name: "hideFindMode"
-      event: transferrableEvent
       query: findMode.rawQuery
+      exitEventIsEnter: event.keyCode == keyCodes.enter
+      exitEventIsEscape: KeyboardUtils.isEscape event
 
   else if event.keyCode == keyCodes.upArrow
     if rawQuery = FindModeHistory.getQuery findMode.historyIndex + 1