diff -up vim81/runtime/defaults.vim.copypaste vim81/runtime/defaults.vim
--- vim81/runtime/defaults.vim.copypaste	2019-10-30 10:30:23.108710252 +0100
+++ vim81/runtime/defaults.vim	2019-10-30 10:36:19.127508406 +0100
@@ -73,18 +73,6 @@ map Q gq
 " Revert with ":iunmap <C-U>".
 inoremap <C-U> <C-G>u<C-U>
 
-" In many terminal emulators the mouse works just fine.  By enabling it you
-" can position the cursor, Visually select and scroll with the mouse.
-" Only xterm can grab the mouse events when using the shift key, for other
-" terminals use ":", select text and press Esc.
-if has('mouse')
-  if &term =~ 'xterm'
-    set mouse=a
-  else
-    set mouse=nvi
-  endif
-endif
-
 " Switch syntax highlighting on when the terminal has colors or when using the
 " GUI (which always has colors).
 if &t_Co > 2 || has("gui_running")