diff --git a/src/testdir/dumps/Test_echowindow_4.dump b/src/testdir/dumps/Test_echowindow_4.dump
new file mode 100644
index 0000000..b674e9e
--- /dev/null
+++ b/src/testdir/dumps/Test_echowindow_4.dump
@@ -0,0 +1,8 @@
+>═+0#e000002#ffffff0@74
+|l|i|n|e| |1|4| @67
+|l|i|n|e| |1|5| @67
+|l|i|n|e| |1|6| @67
+|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| 
diff --git a/src/testdir/test_messages.vim b/src/testdir/test_messages.vim
index 6bdaedf..10af69c 100644
--- a/src/testdir/test_messages.vim
+++ b/src/testdir/test_messages.vim
@@ -396,6 +396,11 @@
         echowindow a:arg
       endfunc
       echowindow 'first line'
+      func ManyMessages()
+        for n in range(20)
+          echowindow 'line' n
+        endfor
+      endfunc
   END
   call writefile(lines, 'XtestEchowindow')
   let buf = RunVimInTerminal('-S XtestEchowindow', #{rows: 8})
@@ -407,6 +412,9 @@
   call term_sendkeys(buf, ":call popup_clear()\<CR>")
   call VerifyScreenDump(buf, 'Test_echowindow_3', {})
 
+  call term_sendkeys(buf, ":call ManyMessages()\<CR>")
+  call VerifyScreenDump(buf, 'Test_echowindow_4', {})
+
   " clean up
   call StopVimInTerminal(buf)
   call delete('XtestEchowindow')