Use shift modifier instead ctrl for multiple selection in canvas.

src/uxbox/ui/keyboard.cljs

@@ -9,5 +9,9 @@
   [event]
   (.-ctrlKey event))
 
+(defn shift?
+  [event]
+  (.-shiftKey event))
+
 (def esc? (is-keycode? 27))
 (def enter? (is-keycode? 13))

src/uxbox/ui/workspace/canvas.cljs

@@ -70,7 +70,7 @@
                   (do
                     (dom/stop-propagation event)
                     (swap! local assoc :init-coords [x y])
-                    (if (.-ctrlKey event)
+                    (if (kbd/shift? event)
                       (rs/emit! (dw/select-shape id))
                       (rs/emit! (dw/deselect-all)
                                 (dw/select-shape id))))