Fix terryma#11 chaining function calls.

Issue: terryma#11 (comment)

autoload/multiple_cursors.vim

@@ -886,21 +886,23 @@ function! s:process_user_input()
  " Grr this is frustrating. In Insert mode, between the feedkey call and here,
  " the current position could actually CHANGE for some odd reason. Forcing a
  " position reset here
- call cursor(s:cm.get_current().position)
+ let cursor_position = s:cm.get_current()
+ call cursor(cursor_position.position)
 
  " Before applying the user input, we need to revert back to the mode the user
  " was in when the input was entered
  call s:revert_mode(s:to_mode, s:from_mode)
 
  " Update the line length BEFORE applying any actions. TODO(terryma): Is there
  " a better place to do this?
- call s:cm.get_current().update_line_length()
+ " let cursor_position = s:cm.get_current()
+ call cursor_position.update_line_length()
  let s:saved_linecount = line('$')
 
  " Restore unnamed register only in Normal mode. This should happen before user
  " input is processed.
  if s:from_mode ==# 'n' || s:from_mode ==# 'v' || s:from_mode ==# 'V'
- call s:cm.get_current().restore_unnamed_register()
+ call cursor_position.restore_unnamed_register()
  endif
 
  " Apply the user input. Note that the above could potentially change mode, we