diff -up vim82/runtime/defaults.vim.copypaste vim82/runtime/defaults.vim

--- vim82/runtime/defaults.vim.copypaste	2022-01-24 12:13:43.000000000 +0100

+++ vim82/runtime/defaults.vim	2022-01-24 12:15:41.050120573 +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

-

 " Only do this part when Vim was compiled with the +eval feature.

 if 1

diff -up vim82/src/testdir/test_balloon.vim.copypaste vim82/src/testdir/test_balloon.vim

--- vim82/src/testdir/test_balloon.vim.copypaste	2022-01-24 12:15:41.051120576 +0100

+++ vim82/src/testdir/test_balloon.vim	2022-01-24 12:17:02.604372440 +0100

@@ -9,6 +9,7 @@ source screendump.vim

 CheckScreendump

 let s:common_script =<< trim [CODE]

+  set mouse=a

   call setline(1, ["one one one", "two tXo two", "three three three"])

   set balloonevalterm balloonexpr=MyBalloonExpr()..s:trailing balloondelay=100

   let s:trailing = '<'  " check that script context is set

diff -up vim82/src/testdir/test_popupwin.vim.copypaste vim82/src/testdir/test_popupwin.vim

--- vim82/src/testdir/test_popupwin.vim.copypaste	2022-01-24 12:13:44.000000000 +0100

+++ vim82/src/testdir/test_popupwin.vim	2022-01-24 12:18:24.382624989 +0100

@@ -553,6 +553,7 @@ func Test_popup_drag()

   " create a popup that covers the command line

   let lines =<< trim END

 	call setline(1, range(1, 20))

+	set mouse=a

 	split

 	vsplit

 	$wincmd w

@@ -625,6 +626,7 @@ func Test_popup_drag_termwin()

   let lines =<< trim END

 	set foldmethod=marker

 	call setline(1, range(100))

+	set mouse=a

 	for nr in range(7)

 	  call setline(nr * 12 + 1, "fold {{{")

 	  call setline(nr * 12 + 11, "end }}}")

@@ -678,6 +680,7 @@ func Test_popup_close_with_mouse()

   let lines =<< trim END

 	call setline(1, range(1, 20))

+	set mouse=a

 	" With border, can click on X

 	let winid = popup_create('foobar', #{

 	      \ close: 'button',

@@ -1513,6 +1516,7 @@ func Test_popup_beval()

   let lines =<< trim END

 	call setline(1, range(1, 20))

 	call setline(5, 'here is some text to hover over')

+	set mouse=a

 	set balloonevalterm

 	set balloonexpr=BalloonExpr()

 	set balloondelay=100

@@ -2218,6 +2222,7 @@ func Test_popup_scrollbar()

   let lines =<< trim END

     call setline(1, range(1, 20))

+    set mouse=a

     hi ScrollThumb ctermbg=blue

     hi ScrollBar ctermbg=red

     let winid = popup_create(['one', 'two', 'three', 'four', 'five',