patch 8.0.0543: test_edit causes older xfce4-terminal to close

Problem:    Test_edit causes older xfce4-terminal to close. (Dominique Pelle)
Solution:   Reduce number of columns to 2000.  Try to restore the window
            position.
diff --git a/src/testdir/test_edit.vim b/src/testdir/test_edit.vim
index 4db7bcf..2df0d6f 100644
--- a/src/testdir/test_edit.vim
+++ b/src/testdir/test_edit.vim
@@ -1328,10 +1328,14 @@
     " Long directory names only work on Unix.
     return
   endif
+  " Try to get the Vim window position before setting 'columns'.
+  let winposx = getwinposx()
+  let winposy = getwinposy()
   let save_columns = &columns
-  set columns=5000
-  call assert_equal(5000, &columns)
+  set columns=2000
+  call assert_equal(2000, &columns)
   set noswapfile
+
   let dirname = getcwd() . "/Xdir"
   let longdirname = dirname . repeat('/' . repeat('d', 255), 4)
   let longfilename = longdirname . '/' . repeat('a', 255)
@@ -1345,5 +1349,8 @@
   exe 'bwipe! ' . longfilename
   call delete(dirname, 'rf')
   let &columns = save_columns
+  if winposx >= 0 && winposy >= 0
+    exe 'winpos ' . winposx . ' ' . winposy
+  endif
   set swapfile&
 endfunc