patch 8.1.0320: too much 'incsearch' highlight for pat matching everything

Problem:    Too much 'incsearch' highlight for pattern matching everything.
Solution:   Add the skiplen to the command and remove the line range.
            (Christian Brabandt)  Check for empty pattern earlier.
diff --git a/src/testdir/dumps/Test_incsearch_substitute_09.dump b/src/testdir/dumps/Test_incsearch_substitute_09.dump
new file mode 100644
index 0000000..633e7d8
--- /dev/null
+++ b/src/testdir/dumps/Test_incsearch_substitute_09.dump
@@ -0,0 +1,9 @@
+|f+0&#ffffff0|o@1| |3| @64
+|f+8&&|o@1| |4| @64
+|f+0&&|o@1| |5| @64
+|f|o@1| |6| @64
+|f|o@1| |7| @64
+|f|o@1| |8| @64
+|f|o@1| |9| @64
+|f|o@1| |1|0| @63
+|:|6|,|7|s|/|\|v> @61
diff --git a/src/testdir/test_search.vim b/src/testdir/test_search.vim
index 9ede26d..ba2d21a 100644
--- a/src/testdir/test_search.vim
+++ b/src/testdir/test_search.vim
@@ -913,6 +913,14 @@
   call VerifyScreenDump(buf, 'Test_incsearch_substitute_08', {})
   call term_sendkeys(buf, "\<Esc>")
 
+  " Only \v handled as empty pattern, does not move cursor
+  call term_sendkeys(buf, '3G4G')
+  call term_sendkeys(buf, ":nohlsearch\<CR>")
+  call term_sendkeys(buf, ':6,7s/\v')
+  sleep 100m
+  call VerifyScreenDump(buf, 'Test_incsearch_substitute_09', {})
+  call term_sendkeys(buf, "\<Esc>")
+
   call StopVimInTerminal(buf)
   call delete('Xis_subst_script')
 endfunc