[menu] global context properties

[Guria]

_firstItem and _checkedItems properties set as global in context.

          { block:'menu', content:[{block:'menu-item', content:'asdasd'}]},
          { block: 'debug'},

block('debug').content()(function(){
    return JSON.stringify(this._firstItem);
});

<div class="menu menu__control i-bem" data-bem="{&quot;menu&quot;:{}}" role="menu" tabindex="0">
  <div class="menu-item i-bem" data-bem="{&quot;menu-item&quot;:{}}" role="menuitem">asdasd</div></div>
<div class="debug">{"block":"menu-item","content":"asdasd","mods":{}}</div>

[narqo]

Nice catch, thanks! We will fix it in the nearest future

[narqo]

Actually, it shouldn't hurt any "real life" usage (as these flags will be reassigned for each menu instance).

But anyway, could you make a separate PR for the issue, so we will merge it?

[Guria]

Okay

[qfox]

👍 for that fix but looks like it's breaking change.

[Guria]

@zxqfox #1523 just bug fix, #1520 more serious change but I don't see what it can brake