patch 9.0.0707: with 'smoothscroll' cursor position not adjusted in long line

Problem:    With 'smoothscroll' and 'scrolloff' non-zero the cursor position
            is not properly adjusted in a long line.
Solution:   Move the cursor further up or down in the line.
diff --git a/src/testdir/test_scroll_opt.vim b/src/testdir/test_scroll_opt.vim
index c369fa8..5bea957 100644
--- a/src/testdir/test_scroll_opt.vim
+++ b/src/testdir/test_scroll_opt.vim
@@ -223,6 +223,28 @@
   call term_sendkeys(buf, "\<C-Y>")
   call VerifyScreenDump(buf, 'Test_smooth_long_5', {})
 
+  " 'scrolloff' set to 1, scrolling up, cursor moves screen line down
+  call term_sendkeys(buf, ":set scrolloff=1\<CR>")
+  call term_sendkeys(buf, "10|\<C-E>")
+  call VerifyScreenDump(buf, 'Test_smooth_long_6', {})
+  
+  " 'scrolloff' set to 1, scrolling down, cursor moves screen line up
+  call term_sendkeys(buf, "\<C-E>")
+  call term_sendkeys(buf, "gjgj")
+  call term_sendkeys(buf, "\<C-Y>")
+  call VerifyScreenDump(buf, 'Test_smooth_long_7', {})
+  
+  " 'scrolloff' set to 2, scrolling up, cursor moves screen line down
+  call term_sendkeys(buf, ":set scrolloff=2\<CR>")
+  call term_sendkeys(buf, "10|\<C-E>")
+  call VerifyScreenDump(buf, 'Test_smooth_long_8', {})
+  
+  " 'scrolloff' set to 2, scrolling down, cursor moves screen line up
+  call term_sendkeys(buf, "\<C-E>")
+  call term_sendkeys(buf, "gj")
+  call term_sendkeys(buf, "\<C-Y>")
+  call VerifyScreenDump(buf, 'Test_smooth_long_9', {})
+  
   call StopVimInTerminal(buf)
 endfunc