vim-patch:8.2.0422: crash when passing popup window to win_splitmove()

Problem:    Crash when passing popup window to win_splitmove(). (john Devin)
Solution:   Disallow moving a popup window. (closes vim/vim#5816)
0f1563ffee

Add translated test for 8.2.0422 (popup->floating)

src/nvim/eval/funcs.c

@@ -4032,7 +4032,8 @@ static void f_win_splitmove(typval_T *argvars, typval_T *rettv, FunPtr fptr)
   targetwin = find_win_by_nr_or_id(&argvars[1]);
 
   if (wp == NULL || targetwin == NULL || wp == targetwin
-      || !win_valid(wp) || !win_valid(targetwin)) {
+      || !win_valid(wp) || !win_valid(targetwin)
+      || win_valid_floating(wp) || win_valid_floating(targetwin)) {
     EMSG(_(e_invalwindow));
     rettv->vval.v_number = -1;
     return;

src/nvim/testdir/test_window_cmd.vim

@@ -845,6 +845,18 @@ func Test_win_splitmove()
   tabclose
 endfunc
 
+func Test_floatwin_splitmove()
+  vsplit
+  let win2 = win_getid()
+  let popup_winid = nvim_open_win(0, 0, {'relative': 'win',
+        \ 'row': 3, 'col': 3, 'width': 12, 'height': 3})
+  call assert_fails('call win_splitmove(popup_winid, win2)', 'E957:')
+  call assert_fails('call win_splitmove(win2, popup_winid)', 'E957:')
+
+  call nvim_win_close(popup_winid, 1)
+  bwipe
+endfunc
+
 func Test_window_resize()
   " Vertical :resize (absolute, relative, min and max size).
   vsplit

src/nvim/window.c

@@ -1619,6 +1619,23 @@ static void win_init_some(win_T *newp, win_T *oldp)
   win_copy_options(oldp, newp);
 }
 
+/// Return TRUE if "win" is floating window in the current tab page.
+///
+/// @param  win  window to check
+bool win_valid_floating(const win_T *win)
+  FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT
+{
+  if (win == NULL) {
+    return false;
+  }
+
+  FOR_ALL_WINDOWS_IN_TAB(wp, curtab) {
+    if (wp == win) {
+      return wp->w_floating;
+    }
+  }
+  return false;
+}
 
 /// Check if "win" is a pointer to an existing window in the current tabpage.
 ///