Dealing with virtual indent inside a function

I have an insert mapping for tab key that works right for existing
lines, but does not work right for a new line with 'virtual' indent
level.

Normally, if it's in a mapping, it can be fixed by adding any key and
then backspace to erase it. I'm trying to do the same inside of a
function, and nothing I've tried works for me.

fun! TriggerSnippet()
if getline('.') =~ '^\s*$'
call feedkeys("x", 't')
:redraw
call feedkeys("\<bs>\<tab>", 'n') | return ''

...
endfu

This is at the top of snipmate's TriggerSnippet, by the way. I think
snipmate has some way of dealing with this but I don't know where it is
or how it works, so if someone can point this out, that might help.
Because I have another function that closes popup menu before triggering
snippet when tab key is pressed, snipmate's workaround for this does not
work.

Any help appreciated!

-ak

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