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" Undo some diff lines
function! diff#prune#Prune(type) abort
" Choose appropriate line ranges depending on mode
if a:type ==# 'v' || a:type ==# 'V' || a:type ==# "\<C-V>"
let l:range = '''<,''>'
else
let l:range = '''[,'']'
endif
" Reinstate removals and remove addenda; preserve search pattern
let l:search_save = @/
silent execute l:range.'substitute/^-/ /e'
silent execute l:range.'global/^+/d'
let @/ = l:search_save
endfunction
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