patch 9.0.0352: using :echowindow in a timer clears part of message

Problem:    using :echowindow in a timer clears part of message
Solution:   Do not use msg_clr_eos().

src/message.c

@@ -1443,7 +1443,7 @@ msg_start(void)
     }
 
 #ifdef FEAT_EVAL
-    if (need_clr_eos || in_echowindow)
+    if (need_clr_eos)
     {
 	// Halfway an ":echo" command and getting an (error) message: clear
 	// any text from the command.
@@ -3646,6 +3646,10 @@ msg_clr_eos(void)
     void
 msg_clr_eos_force(void)
 {
+#ifdef HAS_MESSAGE_WINDOW
+    if (in_echowindow)
+	return;  // messages go into a popup
+#endif
     if (msg_use_printf())
     {
 	if (full_screen)	// only when termcap codes are valid

src/testdir/dumps/Test_echowindow_2.dump

@@ -5,4 +5,4 @@
 |═+0#e000002&@74
 |f|i|r|s|t| |l|i|n|e| @64
 |s|e|c|o|n|d| |l|i|n|e| @63
-| +0#0000000&@56|1|,|1| @10|A|l@1| 
+|:+0#0000000&|c|a|l@1| |S|h|o|w|M|e|s@1|a|g|e|(|'|s|e|c|o|n|d| |l|i|n|e|'|)| @24|1|,|1| @10|A|l@1| 

src/testdir/dumps/Test_echowindow_4.dump

@@ -5,4 +5,4 @@
 |l|i|n|e| |1|7| @67
 |l|i|n|e| |1|8| @67
 |l|i|n|e| |1|9| @67
-| +0#0000000&@56|1|,|1| @10|A|l@1| 
+|:+0#0000000&|c|a|l@1| |M|a|n|y|M|e|s@1|a|g|e|s|(|)| @36|1|,|1| @10|A|l@1| 

src/version.c

@@ -707,6 +707,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    352,
 /**/
     351,
 /**/