patch 8.2.4325: 'wildmenu' only shows few matches

Problem:    'wildmenu' only shows few matches.
Solution:   Add the "pum" option: use a popup menu to show the matches.
            (Yegappan Lakshmanan et al., closes #9707)
diff --git a/src/evalfunc.c b/src/evalfunc.c
index b031369..db0d1ce 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -10336,7 +10336,7 @@
 f_wildmenumode(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
 {
 #ifdef FEAT_WILDMENU
-    if (wild_menu_showing)
+    if (wild_menu_showing || ((State & CMDLINE) && cmdline_pum_active()))
 	rettv->vval.v_number = 1;
 #endif
 }