Don't capture space-key events when typing, to allow using space characters in the search

assets/javascripts/app/shortcuts.coffee

@@ -47,6 +47,7 @@ class app.Shortcuts
       when 27
         @trigger 'escape'
       when 32
+        if not @lastKeypress or @lastKeypress < Date.now() - 1000
           @trigger 'pageDown'
           false
       when 33
@@ -127,3 +128,5 @@ class app.Shortcuts
     if event.which is 63 and not event.target.value
       @trigger 'help'
       false
+    else
+      @lastKeypress = Date.now()