feature request: Cascade popup menu.

[chris]

What about implement the "Cascade popup menu" feature for Vim ?

For now, There are some usage for it:
1. When there are two or more same name triggers for snippets, the Cascade popup
menu can use sublist very well.
2. Can show more information. Like show selected candidate
property/attribute/prototype etc.
3. On some situations, it can replace preview window. Preview window is annoying
when completing in some cases, it will change the window size, etc.

I think the "Cascade popup menu" can be same with the first level popup menu
that is a list of candidates, also the cascade popup menu can be a stuff like
"Tooltip" for showing property etc info. Show info in this way is better than
show in preview window and statusline or command line.

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