vim-patch:8.2.4700: buffer remains active if WinClosed event throws an exception

Problem:    Buffer remains active if a WinClosed event throws an exception.
Solution:   Ignore aborting() when closing the buffer. (closes vim/vim#10097)
c947b9ae41

src/nvim/testdir/test_autocmd.vim

@@ -299,6 +299,23 @@ func Test_WinClosed()
   unlet g:triggered
 endfunc
 
+func Test_WinClosed_throws()
+  vnew
+  let bnr = bufnr()
+  call assert_equal(1, bufloaded(bnr))
+  augroup test-WinClosed
+    autocmd WinClosed * throw 'foo'
+  augroup END
+  try
+    close
+  catch /.*/
+  endtry
+  call assert_equal(0, bufloaded(bnr))
+
+  autocmd! test-WinClosed
+  augroup! test-WinClosed
+endfunc
+
 func s:AddAnAutocmd()
   augroup vimBarTest
     au BufReadCmd * echo 'hello'

src/nvim/window.c

@@ -2563,7 +2563,7 @@ static void win_close_buffer(win_T *win, bool free_buf, bool abort_if_last)
     bufref_T bufref;
     set_bufref(&bufref, curbuf);
     win->w_closing = true;
-    close_buffer(win, win->w_buffer, free_buf ? DOBUF_UNLOAD : 0, abort_if_last, false);
+    close_buffer(win, win->w_buffer, free_buf ? DOBUF_UNLOAD : 0, abort_if_last, true);
     if (win_valid_any_tab(win)) {
       win->w_closing = false;
     }