Replace all references to selection.type with our FF polyfill

Credit to @gdh1995 for catching these oversights.

2 files changed, 8 insertions, 11 deletions

diff --git a/content_scripts/mode_find.coffee b/content_scripts/mode_find.coffee
index 950b08e9..f19b5db4 100644
--- a/content_scripts/mode_find.coffee
+++ b/content_scripts/mode_find.coffee
@@ -6,7 +6,7 @@ class SuppressPrintable extends Mode
   constructor: (options) ->
     super options
     handler = (event) => if KeyboardUtils.isPrintable event then @suppressEvent else @continueBubbling
-    type = document.getSelection().type
+    type = DomUtils.getSelectionType()
 
     # We use unshift here, so we see events after normal mode, so we only see unmapped keys.
     @unshift
@@ -16,7 +16,7 @@ class SuppressPrintable extends Mode
       keyup: (event) =>
         # If the selection type has changed (usually, no longer "Range"), then the user is interacting with
         # the input element, so we get out of the way.  See discussion of option 5c from #1415.
-        @exit() if document.getSelection().type != type
+        @exit() if DomUtils.getSelectionType() != type
 
 # When we use find, the selection/focus can land in a focusable/editable element.  In this situation, special
 # considerations apply.  We implement three special cases:
@@ -235,17 +235,14 @@ class FindMode extends Mode
 
 getCurrentRange = ->
   selection = getSelection()
-  if selection.type == "None"
+  if DomUtils.getSelectionType(selection) == "None"
     range = document.createRange()
     range.setStart document.body, 0
     range.setEnd document.body, 0
     range
   else
-    selection.collapseToStart() if selection.type == "Range"
-    if selection.rangeCount > 0
-      selection.getRangeAt 0
-    else # Firefox returns a selection with no ranges and null anchor/focusNode in some situations.
-      null
+    selection.collapseToStart() if DomUtils.getSelectionType(selection) == "Range"
+    selection.getRangeAt 0
 
 getLinkFromSelection = ->
   node = window.getSelection().anchorNode
diff --git a/lib/dom_utils.coffee b/lib/dom_utils.coffee
index b44f5f51..d8a5d203 100644
--- a/lib/dom_utils.coffee
+++ b/lib/dom_utils.coffee
@@ -219,7 +219,7 @@ DomUtils =
       node = selection.anchorNode
       node and @isDOMDescendant element, node
     else
-      if selection.type == "Range" and selection.isCollapsed
+      if DomUtils.getSelectionType(selection) == "Range" and selection.isCollapsed
 	      # The selection is inside the Shadow DOM of a node. We can check the node it registers as being
 	      # before, since this represents the node whose Shadow DOM it's inside.
         containerNode = selection.anchorNode.childNodes[selection.anchorOffset]
@@ -364,7 +364,7 @@ DomUtils =
       handlerStack.suppressEvent
 
   # Polyfill for selection.type (which is not available in Firefox).
-  getSelectionType: (selection) ->
+  getSelectionType: (selection = document.getSelection()) ->
     selection.type or do ->
       if selection.rangeCount == 0
         "None"
@@ -377,7 +377,7 @@ DomUtils =
   # This finds the element containing the selection focus.
   getElementWithFocus: (selection, backwards) ->
     r = t = selection.getRangeAt 0
-    if selection.type == "Range"
+    if DomUtils.getSelectionType(selection) == "Range"
       r = t.cloneRange()
       r.collapse backwards
     t = r.startContainer