vim-patch:8.2.2249: termcodes test is flaky when used over ssh

Problem:    Termcodes test is flaky when used over ssh with X forwarding.
Solution:   Set 'mousetime' to a larger value. (Dominique Pellé, closes vim/vim#7576,
            closes vim/vim#7563)

2a5c61a019

test/old/testdir/test_termcodes.vim

@@ -680,8 +680,11 @@ func Test_term_mouse_multiple_clicks_to_visually_select()
   let save_term = &term
   " let save_ttymouse = &ttymouse
   " call test_override('no_query_mouse', 1)
-  " set mouse=a term=xterm mousetime=200
-  set mouse=a mousetime=200
+
+  " 'mousetime' must be sufficiently large, or else the test is flaky when
+  " using a ssh connection with X forwarding; i.e. ssh -X (issue #7563).
+  " set mouse=a term=xterm mousetime=600
+  set mouse=a mousetime=600
   new
 
   for ttymouse_val in g:Ttymouse_values + g:Ttymouse_dec