patch 8.2.4916: mouse in Insert mode test fails

Problem:    Mouse in Insert mode test fails.
Solution:   Fix the text and check relevant positions.

Author: brammool

src/testdir/test_edit.vim

@@ -1213,20 +1213,28 @@ func Test_edit_MOUSE()
   10new
   call setline(1, range(1, 100))
   call cursor(1, 1)
+  call assert_equal(1, line('w0'))
+  call assert_equal(10, line('w$'))
   set mouse=a
+  " One scroll event moves three lines.
   call feedkeys("A\<ScrollWheelDown>\<esc>", 'tnix')
-  call assert_equal([0, 4, 1, 0], getpos('.'))
-  " This should move by one pageDown, but only moves
-  " by one line when the test is run...
+  call assert_equal(4, line('w0'))
+  call assert_equal(13, line('w$'))
+  " This should move by one page down.
   call feedkeys("A\<S-ScrollWheelDown>\<esc>", 'tnix')
-  call assert_equal([0, 5, 1, 0], getpos('.'))
+  call assert_equal(14, line('w0'))
   set nostartofline
+  " Another page down.
   call feedkeys("A\<C-ScrollWheelDown>\<esc>", 'tnix')
-  call assert_equal([0, 6, 1, 0], getpos('.'))
+  call assert_equal(24, line('w0'))
+
+  call assert_equal([0, 24, 2, 0], getpos('.'))
+  call test_setmouse(4, 3)
   call feedkeys("A\<LeftMouse>\<esc>", 'tnix')
-  call assert_equal([0, 6, 1, 0], getpos('.'))
-  call feedkeys("A\<RightMouse>\<esc>", 'tnix')
-  call assert_equal([0, 6, 1, 0], getpos('.'))
+  call assert_equal([0, 27, 2, 0], getpos('.'))
+  call test_setmouse(5, 3)
+  call feedkeys("A\<RightMouse>\<esc>\<esc>", 'tnix')
+  call assert_equal([0, 28, 2, 0], getpos('.'))
   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 */
+/**/
+    4916,
 /**/
     4915,
 /**/