如何在Gnome 3.28和rhel7.6中创建子菜单的子菜单

Question

我正在寻找gnome3.28和rhel 7.6中的子菜单的子菜单

但是看起来gnome3和rhel7只允许一个子菜单。

有什么办法可以拥有子菜单的子菜单吗？

我已经在gnome2和rhel6中尝试了以下相同的步骤，并且效果很好，但是在rhel7和gnome3中却无法正常工作，整个子菜单目录Submenu1和Submenu2都消失了。提前致谢。我还使用了Alacarte来创建子菜单的子菜单，但是它与手动创建桌面文件的方式相同，并且不起作用

所以，如果我想要这样的东西，那就很好

Applications > CustomMenu > Submenu1 Applications > CustomMenu > Submenu2 

但是如果我想要这样的东西就行不通了

Applications > CustomMenu > Submenu1 > Submenu1A Applications > CustomMenu > Submenu1 > Submenu1B Applications > CustomMenu > Submenu2
Submenu2A Applications > CustomMenu > Submenu2 > Submenu2B

的工作案例

应用程序> CustomMenu>子菜单1应用程序> CustomMenu> Submenu2

/etc/xdg/menus/applications-merged/CustomMenu.menu



```<!DOCTYPE Menu PUBLIC "-//freedesktop//DTD Menu 1.0//EN" 
"http://www.freedesktop.org/standards/menu-spec/menu-1.0.dtd"> <Menu>

   <Name>Applications</Name>    
   <Menu>
     <Name>CustomMenu</Name>
     <Directory>CustomMenu.directory</Directory>
     <Include>
       <And>
         <Category>CustomMenu</Category>

       </And>
     </Include>    
   </Menu> <!-- End CustomMenu -->

 </Menu>

/usr/share/desktop-directories/CustomMenu.directory

```[Desktop Entry]
Name=CustomMenu
Comment=Custom Menu
Type=Directory
```
/usr/share/applications/submenu1.directory

```[Desktop Entry]
Encoding=UTF-8
Name=Submenu1
Exec=java -jar /tmp/submenu1.jar
Categories=CustomMenu;Submenu1;
Type=Application
Terminal=true
```
/usr/share/applications/submenu2.directory

```[Desktop Entry]
Encoding=UTF-8
Name=Submenu2
Exec=java -jar /tmp/submenu2.jar
Categories=CustomMenu;Submenu2;
Type=Application
Terminal=true
```

Not working case for 

Applications > CustomMenu > Submenu1 > Submenu1A
Applications > CustomMenu > Submenu1 > Submenu1B
Applications > CustomMenu > Submenu2 > Submenu2A
Applications > CustomMenu > Submenu2 > Submenu2B

/etc/xdg/menus/applications-merged/CustomMenu.menu


<!DOCTYPE Menu PUBLIC "-//freedesktop//DTD Menu 1.0//EN"
 "http://www.freedesktop.org/standards/menu-spec/menu-1.0.dtd">
<Menu>

  <Name>Applications</Name>
   <Menu>
    <Name>CustomMenu</Name>
    <Directory>CustomMenu.directory</Directory>
    <Include>
      <And>
        <Category>CustomMenu</Category>
         <Not>
          <Category>Submenu1</Category>
          <Category>Submenu2</Category>
         </Not>
      </And>
    </Include>
    <Menu>
    <Name>SubMenu1</Name>
    <Directory>Submenu1.directory</Directory>
    <Include>
      <And>
       <Category>Submenu1</Category>
      </And>
    </Include>
    </Menu>
    <Menu>
    <Name>SubMenu2</Name>
    <Directory>Submenu2.directory</Directory>
    <Include>
      <And>
       <Category>Submenu2</Category>
      </And>
    </Include>
    </Menu>


   </Menu> <!-- End CustomMenu -->

</Menu>
```

The /usr/share/desktop-directories/CustomMenu.directory is same as before

I have added

/usr/share/desktop-directories/Submenu1.directory




[Desktop Entry]     Name=Submenu1   Comment=Sub Menu 1      Type=Directory



/usr/share/desktop-directories/Submenu2.directory



[Desktop Entry]     Name=Submenu2   Comment=Sub Menu 2      Type=Directory 

>   

/usr/share/applications/submenu1A.directory
        [Desktop Entry]
        Encoding=UTF-8  
Name=Submenu1A      Exec=java -jar /tmp/submenu1A.jar
        Categories=CustomMenu;Submenu1;Submenu1A;   Type=Application
    Terminal=true

    /usr/share/applications/submenu1B.directory


[Desktop Entry]     Encoding=UTF-8      Name=Submenu1B      Exec=java -jar /tmp/submenu1B.jar   Categories=CustomMenu;Submenu1;Submenu1B;
Type=Application    Terminal=true
> 
/usr/share/applications/submenu2A.directory
> 
        [Desktop Entry]         Encoding=UTF-8          Name=Submenu2A          Exec=java -jar /tmp/submenu2A.jar       Categories=CustomMenu;Submenu2;Submenu2A;
    Type=Application        Terminal=true


>   /usr/share/applications/submenu2B.directory
>

        [Desktop Entry]         Encoding=UTF-8          Name=Submenu2B          Exec=java -jar /tmp/submenu2B.jar       Categories=CustomMenu;Submenu2;Submenu2B;
    Type=Application        Terminal=true