Support non-English keyboard languages

Use event.which if it is lower than the parsed key identifier.
This is the case when a non-English keyboard language is selected and
a physical English keyboard is being used.

This allows keybindings to still work even when the physical key pressed
is different than the key it maps to for the currently selected language.

Closes #585

spec/app/keymap-spec.coffee

@@ -35,10 +35,22 @@ describe "Keymap", ->
       keymap.handleKeyEvent(event)
       expect(event.keystrokes).toBe 'alt-meta-x'
 
+      event = keydownEvent(',', metaKey: true)
+      event.which = 188
+      keymap.handleKeyEvent(event)
+      expect(event.keystrokes).toBe 'meta-,'
+
     describe "when no binding matches the event's keystroke", ->
       it "does not return false so the event continues to propagate", ->
         expect(keymap.handleKeyEvent(keydownEvent('0', target: fragment[0]))).not.toBe false
 
+    describe "when a non-English keyboard language is used", ->
+      it "uses the physical character pressed instead of the character it maps to in the current language", ->
+        event = keydownEvent('U+03B6', metaKey: true) # This is the 'z' key using the Greek keyboard layout
+        event.which = 122
+        keymap.handleKeyEvent(event)
+        expect(event.keystrokes).toBe 'meta-z'
+
     describe "when at least one binding fully matches the event's keystroke", ->
       describe "when the event's target node matches a selector with a matching binding", ->
         it "triggers the command event associated with that binding on the target node and returns false", ->

src/app/keymap.coffee

@@ -150,6 +150,7 @@ class Keymap
     if event.originalEvent.keyIdentifier.indexOf('U+') == 0
       hexCharCode = event.originalEvent.keyIdentifier[2..]
       charCode = parseInt(hexCharCode, 16)
+      charCode = Math.min(event.which, charCode) if event.which?
       key = @keyFromCharCode(charCode)
     else
       key = event.originalEvent.keyIdentifier.toLowerCase()