The lastContextMenu is not initialized leading to a crash when a item in ContextMenu is clicked on

[p0lygun]

as discussed in #27 , after v9 the context menu is imported and hence not accessible to hookup directly, instead of using that we can hook _Blockly.getMainWorkspace().showContextMenu as that calls to ContextMenu.show() in the end

I am able to fix the crash by doing this

    function hookContextMenu() {
        if(!_Blockly.getMainWorkspace()){
            setTimeout(hookContextMenu, 100);
            return;
        }
        const originalShow = _Blockly.getMainWorkspace().showContextMenu
        _Blockly.getMainWorkspace().showContextMenu = function (e) {
            lastContextMenu = {
                e: e,
                options: _Blockly.ContextMenuRegistry.registry.getContextMenuOptions(
                    _Blockly.ContextMenuRegistry.ScopeType.WORKSPACE, {workspace: _Blockly.getMainWorkspace()}
                ),
                rtl: _Blockly.getMainWorkspace().RTL
            };
            updateMouseCoords(e);
            return originalShow.apply(this, arguments);
        }
    }

[LennardF1989]

Closing this as it's tracked by #27 and should be fixed with 2.0.0-pr.