patch 7.4.2146
Problem:    Not enough testing for popup menu.  CTRL-E does not always work
            properly.
Solution:   Add more tests.  When using CTRL-E check if the popup menu is
            visible. (Christian Brabandt)
diff --git a/src/edit.c b/src/edit.c
index a60d922..6dae4a0 100644
--- a/src/edit.c
+++ b/src/edit.c
@@ -3891,8 +3891,9 @@
 		    && pum_visible())
 		retval = TRUE;
 
-	    /* CTRL-E means completion is Ended, go back to the typed text. */
-	    if (c == Ctrl_E)
+	    /* CTRL-E means completion is Ended, go back to the typed text.
+	     * but only do this, if the Popup is still visible */
+	    if (c == Ctrl_E && pum_visible())
 	    {
 		ins_compl_delete();
 		if (compl_leader != NULL)