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kaios: Make F10 open and close the menu

This is no use on KaiOS itself, but provides a way to open the menu from
the keyboard on desktop browsers for testing (and for
keyboard-accessibility in general).

--- a/emccpre.js

+++ b/emccpre.js

@@ -491,7 +491,7 @@

         if (dlg_dimmer !== null)

             return;

         if (!["ArrowLeft", "ArrowRight", "ArrowUp", "ArrowDown", "Enter",

-              "Escape", "Backspace", "SoftRight"]

+              "Escape", "Backspace", "SoftRight", "F10"]

             .includes(event.key))

             return;

         if (ishorizontal(thismenu)) {

@@ -535,7 +535,7 @@

         else if (event.key == "Enter")

             event.target.click();

         else if (event.key == "Escape" || event.key == "SoftRight" ||

-                 event.key == "Backspace")

+                 event.key == "F10" || event.key == "Backspace")

             // Leave the menu entirely.

             onscreen_canvas.focus();

         // Prevent default even if we didn't do anything, as long as this

@@ -599,7 +599,7 @@

     document.addEventListener("keydown", function(event) {

         // Key to open the menu on KaiOS.

-        if (event.key == "SoftRight" &&

+        if ((event.key == "SoftRight" || event.key == "F10") &&

             !menuform.contains(document.activeElement)) {

             menuform.querySelector("li div").focus();

             event.preventDefault();