patch 8.1.2399: info popup on top of cursor if it doesn't fit

Problem:    Info popup on top of cursor if it doesn't fit.
Solution:   Hide the popup if it doesn't fit.
diff --git a/src/popupmenu.c b/src/popupmenu.c
index 14539ad..ceb72b4 100644
--- a/src/popupmenu.c
+++ b/src/popupmenu.c
@@ -661,7 +661,13 @@
 	// align with the selected item
 	row += pum_selected - pum_first + 1;
 
-    popup_set_wantpos_rowcol(wp, row, col);
+    wp->w_popup_flags &= ~POPF_HIDDEN;
+    if (wp->w_maxwidth < 10)
+	// The popup is not going to fit or will overlap with the cursor
+	// position, hide the popup.
+	wp->w_popup_flags |= POPF_HIDDEN;
+    else
+	popup_set_wantpos_rowcol(wp, row, col);
 }
 #endif