patch 8.2.0836: not all :cdo output is visible

Problem:    Not all :cdo output is visible.
Solution:   Reset 'shortmess' temporarily. (Yegappan Lakshmanan, closes #6155)

src/ex_cmds2.c

@@ -643,7 +643,13 @@ ex_listdo(exarg_T *eap)
 
 		qf_idx = qf_get_cur_idx(eap);
 
+		// Clear 'shm' to avoid that the file message overwrites
+		// any output from the command.
+		p_shm_save = vim_strsave(p_shm);
+		set_option_value((char_u *)"shm", 0L, (char_u *)"", 0);
 		ex_cnext(eap);
+		set_option_value((char_u *)"shm", 0L, p_shm_save, 0);
+		vim_free(p_shm_save);
 
 		// If jumping to the next quickfix entry fails, quit here
 		if (qf_get_cur_idx(eap) == qf_idx)

src/testdir/test_cdo.vim

@@ -8,22 +8,22 @@ func SetUp()
   call writefile(["Line1", "Line2", "Line3"], 'Xtestfile1')
   call writefile(["Line1", "Line2", "Line3"], 'Xtestfile2')
   call writefile(["Line1", "Line2", "Line3"], 'Xtestfile3')
-endfunction
+endfunc
 
 " Remove the files used by the tests
-function TearDown()
+func TearDown()
   call delete('Xtestfile1')
   call delete('Xtestfile2')
   call delete('Xtestfile3')
-endfunction
+endfunc
 
 " Returns the current line in '<filename> <linenum>L <column>C' format
-function GetRuler()
+func GetRuler()
   return expand('%') . ' ' . line('.') . 'L' . ' ' . col('.') . 'C'
-endfunction
+endfunc
 
 " Tests for the :cdo and :ldo commands
-function XdoTests(cchar)
+func XdoTests(cchar)
   enew
 
   " Shortcuts for calling the cdo and ldo commands
@@ -132,10 +132,10 @@ function XdoTests(cchar)
   exe XdoCmd
   call assert_equal(['Xtestfile3 3L 1C'], l)
 
-endfunction
+endfunc
 
 " Tests for the :cfdo and :lfdo commands
-function XfdoTests(cchar)
+func XfdoTests(cchar)
   enew
 
   " Shortcuts for calling the cfdo and lfdo commands
@@ -189,16 +189,28 @@ function XfdoTests(cchar)
   exe XfdoCmd
   call assert_equal(['Xtestfile2 2L 5C'], l)
 
-endfunction
+endfunc
 
 " Tests for cdo and cfdo
-function Test_cdo()
+func Test_cdo()
   call XdoTests('c')
   call XfdoTests('c')
-endfunction
+endfunc
 
 " Tests for ldo and lfdo
-function Test_ldo()
+func Test_ldo()
   call XdoTests('l')
   call XfdoTests('l')
-endfunction
+endfunc
+
+" Test for making 'shm' doesn't interfere with the output.
+func Test_cdo_print()
+  enew | only!
+  cgetexpr ["Xtestfile1:1:Line1", "Xtestfile2:1:Line1", "Xtestfile3:1:Line1"]
+  cdo print
+  call assert_equal('Line1', Screenline(&lines))
+  call assert_equal('Line1', Screenline(&lines - 3))
+  call assert_equal('Line1', Screenline(&lines - 6))
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    836,
 /**/
     835,
 /**/