[Feature Request] Subfolder in `filetype` snippets folder & Specific `extends` and `excludes` about ultisnips HOT 2 CLOSED

Excludes is really, really hard to get right I think. Extends is already supported, however it works on filetype basis and not on snippet files basis. Are you familiar with dotted filetypes? I use them all the time to extend the scope of my snippets and pull others in. So for example, you could have a filetype markdown_katex with corresponding snippets and if you want to use it in a markdown file, you simply define the filetype to be markdown.markdown_katex. Would that help you some?

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Excludes is really, really hard to get right I think. Extends is already supported, however it works on filetype basis and not on snippet files basis. Are you familiar with dotted filetypes? I use them all the time to extend the scope of my snippets and pull others in. So for example, you could have a filetype markdown_katex with corresponding snippets and if you want to use it in a markdown file, you simply define the filetype to be markdown.markdown_katex. Would that help you some?

Thanks. I have a basic understanding of dotted filetypes. I've tried to avoid using it before since I thought it seemed to mess up the filetype, and was inconvenient to change(That means, I have to change original filetype markdown to something likes markdown.math). However, I'll look into this feature and have a try. Thanks!

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