Fix behavior of QFToggle

[romainl]

No description provided.

[ntnn]

Started working on this here, based on what I already had.

It works really well, but I'm unhappy with the time ToggleQuickfix needs:

FUNCTIONS SORTED ON TOTAL TIME
count  total (s)   self (s)  function
    4   0.012994   0.000824  qf#ToggleQuickfix()
    2   0.000110   0.000093  sy#start()
    1   0.000074             qf#ToggleLocationList()
    2   0.000072             qf#ReuseTitle()
    2   0.000017             <SNR>45_skip()
                             qf#NextFile()
                             qf#JumpToFirstItemOfFileChunk()
                             qf#SetStatusline()
                             qf#DoList()
                             sy#toggle()
                             qf#PreviousFile()
                             qf#AddTitle()
                             sy#buffer_is_active()
                             sy#disable()
                             qf#JumpFileChunk()
                             sy#enable()
                             qf#SetTitle()
                             qf#FunctionName()
                             qf#AddList()
                             qf#SetList()

But the problem isn't the code - its :cclose and :copen:

FUNCTION  qf#ToggleQuickfix()
Called 4 times
Total time:   0.012994
 Self time:   0.000824

count  total (s)   self (s)
    4              0.000045     if get(t:, 'quickfix_window', 0)
    2              0.000011         if t:quickfix_window == winnr()
                                        " jump back to the previous window if inside the quickfix
                                        " window, otherwise it jumps to the next window in the list
                                        wincmd p
                                    endif
    2   0.000918   0.000280         cclose
    2              0.000007         let t:quickfix_window = 0
    2              0.000002     else
    2   0.011943   0.000410         copen
    2              0.000007         let t:quickfix_window = 1
    2              0.000002     endif

If you could profile it yourself and see if its an actual problem or my
setup, that'd be nice.

[romainl]

Toggling is now part of vim-qf as of version 0.0.9.