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)

src/mouse.c

@@ -1967,7 +1967,8 @@ retnomove:
 
 	// Only use ScreenCols[] after the window was redrawn.  Mainly matters
 	// for tests, a user would not click before redrawing.
-	if (curwin->w_redr_type <= VALID_NO_UPDATE)
+	// Do not use when 'virtualedit' is active.
+	if (curwin->w_redr_type <= VALID_NO_UPDATE && !virtual_active())
 	    col_from_screen = ScreenCols[off];
 #ifdef FEAT_FOLDING
 	// Remember the character under the mouse, it might be a '-' or '+' in

src/testdir/test_virtualedit.vim

@@ -537,4 +537,39 @@ func Test_global_local_virtualedit()
   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

src/version.c

@@ -735,6 +735,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    177,
 /**/
     176,
 /**/