confirm arrow on doubleclick (#949)

* confirm arrow on double click

* change hint

* fix cursor not updating on click

src/constants.ts

@@ -1,4 +1,5 @@
 export const DRAGGING_THRESHOLD = 10; // 10px
+export const ARROW_CONFIRM_THRESHOLD = 10; // 10px
 export const ELEMENT_SHIFT_TRANSLATE_AMOUNT = 5;
 export const ELEMENT_TRANSLATE_AMOUNT = 1;
 export const TEXT_TO_CENTER_SNAP_THRESHOLD = 30;
@@ -6,6 +7,7 @@ export const CURSOR_TYPE = {
   TEXT: "text",
   CROSSHAIR: "crosshair",
   GRABBING: "grabbing",
+  POINTER: "pointer",
 };
 export const POINTER_BUTTON = {
   MAIN: 0,