patch 9.0.0177: cursor position wrong with 'virtualedit' and mouse click

Problem:    Cursor position wrong with 'virtualedit' and mouse click after end
            of the line. (Hermann Mayer)
Solution:   Do not use ScreenCols[] when 'virtualedit' is active.
            (closes #10868)
diff --git a/src/testdir/test_virtualedit.vim b/src/testdir/test_virtualedit.vim
index b31f3a2..8fd6d98 100644
--- a/src/testdir/test_virtualedit.vim
+++ b/src/testdir/test_virtualedit.vim
@@ -537,4 +537,39 @@
   set virtualedit&
 endfunc
 
+func Test_virtualedit_mouse()
+  let save_mouse = &mouse
+  set mouse=a
+  set virtualedit=all
+  new
+
+  call setline(1, ["text\tword"])
+  redraw
+  call test_setmouse(1, 4)
+  call feedkeys("\<LeftMouse>", "xt")
+  call assert_equal([0, 1, 4, 0, 4], getcurpos())
+  call test_setmouse(1, 5)
+  call feedkeys("\<LeftMouse>", "xt")
+  call assert_equal([0, 1, 5, 0, 5], getcurpos())
+  call test_setmouse(1, 6)
+  call feedkeys("\<LeftMouse>", "xt")
+  call assert_equal([0, 1, 5, 1, 6], getcurpos())
+  call test_setmouse(1, 7)
+  call feedkeys("\<LeftMouse>", "xt")
+  call assert_equal([0, 1, 5, 2, 7], getcurpos())
+  call test_setmouse(1, 8)
+  call feedkeys("\<LeftMouse>", "xt")
+  call assert_equal([0, 1, 5, 3, 8], getcurpos())
+  call test_setmouse(1, 9)
+  call feedkeys("\<LeftMouse>", "xt")
+  call assert_equal([0, 1, 6, 0, 9], getcurpos())
+  call test_setmouse(1, 15)
+  call feedkeys("\<LeftMouse>", "xt")
+  call assert_equal([0, 1, 10, 2, 15], getcurpos())
+
+  bwipe!
+  let &mouse = save_mouse
+  set virtualedit&
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab