I have sofftabstop (and shiftwidth) set to 4, and expandtab enabled. Thus, when 
deleting groups of spaces, vim treats them as tabs and deletes them 4 at a 
time. I want vim to do that only if from the start of the line and up to the 
cursor's position there's only spaces and nothing else.
Currently I'm doing the following:

inoremap <silent> <BS> <C-R>=fbs()<CR>

function fbs()
    if getline('.') =~ '^ \{' . (col('.') - 1) . '}' 
        return "\<BS>"
    endif
    return "\<Left>\<Del>"
endfunction

It works, but it breaks the repeat (dot) command, and I don't want that :). I 
think it's because of the <Left>. Any help (either modifying the previous code 
so that it doesn't break the dot command or coming up with a new one that 
doesn't) is appreciated.

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