promenu: return a scroller (fixes alarms app)

apps/promenu/bootb2.js

@@ -28,6 +28,9 @@ E.showMenu = function (items) {
         y += 22;
     var lastIdx = 0;
     var selectEdit = undefined;
+    var scroller = {
+        scroll: selected,
+    };
     var l = {
         draw: function (rowmin, rowmax) {
             var rows = 0 | Math.min((y2 - y) / fontHeight, menuItems.length);
@@ -138,9 +141,11 @@ E.showMenu = function (items) {
             else {
                 var lastSelected = selected;
                 selected = (selected + dir + menuItems.length) % menuItems.length;
+                scroller.scroll = selected;
                 l.draw(Math.min(lastSelected, selected), Math.max(lastSelected, selected));
             }
         },
+        scroller: scroller,
     };
     l.draw();
     var back = options.back;

apps/promenu/bootb2.ts

@@ -35,6 +35,10 @@ E.showMenu = (items?: Menu): MenuInstance => {
   let lastIdx = 0;
   let selectEdit: undefined | ActualMenuItem = undefined;
 
+  const scroller = {
+    scroll: selected,
+  };
+
   const l = {
     draw: (rowmin?: number, rowmax?: number) => {
       let rows = 0|Math.min((y2 - y) / fontHeight, menuItems.length);
@@ -156,9 +160,11 @@ E.showMenu = (items?: Menu): MenuInstance => {
       } else {
         const lastSelected = selected;
         selected = (selected + dir + /*keep +ve*/menuItems.length) % menuItems.length;
+        scroller.scroll = selected;
         l.draw(Math.min(lastSelected, selected), Math.max(lastSelected, selected));
       }
     },
+    scroller,
   };
 
   l.draw();