patch 8.2.4922: mouse test fails on MS-Windows

Problem:    Mouse test fails on MS-Windows.
Solution:   Set 'mousemodel' to "extend".

src/testdir/test_edit.vim

@@ -1232,9 +1232,11 @@ func Test_edit_MOUSE()
   call test_setmouse(4, 3)
   call feedkeys("A\<LeftMouse>\<esc>", 'tnix')
   call assert_equal([0, 27, 2, 0], getpos('.'))
+  set mousemodel=extend
   call test_setmouse(5, 3)
   call feedkeys("A\<RightMouse>\<esc>\<esc>", 'tnix')
   call assert_equal([0, 28, 2, 0], getpos('.'))
+  set mousemodel&
   call cursor(1, 100)
   norm! zt
   " this should move by a screen up, but when the test

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4922,
 /**/
     4921,
 /**/