Patch 7.4.1912
Problem:    No test for using setqflist() on an older quickfix list.
Solution:   Add a couple of tests.
Files:      src/testdir/test_quickfix.vim


*** ../vim-7.4.1911/src/testdir/test_quickfix.vim       2016-05-25 
21:22:56.421828207 +0200
--- src/testdir/test_quickfix.vim       2016-06-09 22:06:03.319965107 +0200
***************
*** 752,760 ****
--- 752,803 ----
    call SetXlistTests('c', bnum)
    call SetXlistTests('l', bnum)
  
+   enew!
    call delete('Xtestfile')
  endfunction
  
+ func Test_setqflist_empty_middle()
+   " create three quickfix lists
+   vimgrep Test_ test_quickfix.vim
+   let testlen = len(getqflist())
+   call assert_true(testlen > 0)
+   vimgrep empty test_quickfix.vim
+   call assert_true(len(getqflist()) > 0)
+   vimgrep matches test_quickfix.vim
+   let matchlen = len(getqflist())
+   call assert_true(matchlen > 0)
+   colder
+   " make the middle list empty
+   call setqflist([], 'r')
+   call assert_true(len(getqflist()) == 0)
+   colder
+   call assert_equal(testlen, len(getqflist()))
+   cnewer
+   cnewer
+   call assert_equal(matchlen, len(getqflist()))
+ endfunc
+ 
+ func Test_setqflist_empty_older()
+   " create three quickfix lists
+   vimgrep one test_quickfix.vim
+   let onelen = len(getqflist())
+   call assert_true(onelen > 0)
+   vimgrep two test_quickfix.vim
+   let twolen = len(getqflist())
+   call assert_true(twolen > 0)
+   vimgrep three test_quickfix.vim
+   let threelen = len(getqflist())
+   call assert_true(threelen > 0)
+   colder 2
+   " make the first list empty, check the others didn't change
+   call setqflist([], 'r')
+   call assert_true(len(getqflist()) == 0)
+   cnewer
+   call assert_equal(twolen, len(getqflist()))
+   cnewer
+   call assert_equal(threelen, len(getqflist()))
+ endfunc
+ 
  function! XquickfixSetListWithAct(cchar)
    let Xolder = a:cchar . 'older'
    let Xnewer = a:cchar . 'newer'
*** ../vim-7.4.1911/src/version.c       2016-06-09 20:24:24.312049004 +0200
--- src/version.c       2016-06-09 22:13:13.423959190 +0200
***************
*** 755,756 ****
--- 755,758 ----
  {   /* Add new patch number below this line */
+ /**/
+     1912,
  /**/

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