Patch 8.2.1038
Problem:    Popupwin test fails.
Solution:   Fix WaitForAssert() argument.
Files:      src/testdir/test_popupwin.vim


diff --git a/src/testdir/test_registers.vim b/src/testdir/test_registers.vim
index 627799c4931..ce4f0b68a5b 100644
--- a/src/testdir/test_registers.vim
+++ b/src/testdir/test_registers.vim
@@ -633,4 +633,22 @@ func Test_execute_reg_as_ex_cmd()
   call assert_equal(repeat('abcdefghijklmnopqrstuvwxyz', 312), str)
 endfunc
 
+" Test for clipboard registers with ASCII NUL
+func Test_clipboard_nul()
+  CheckFeature clipboard_working
+  new
+
+  " Test for putting ASCII NUL into the clipboard
+  set clipboard=unnamed
+  call append(0, "\ntest")
+  normal ggyyp
+  call assert_equal("^@test^@", strtrans(getreg('*')))
+  call assert_equal(getline(1), getline(2))
+  let b = split(execute(":reg *"), "\n")
+  call assert_match('"\*\s*\^@test\^J',b[1])
+
+  set clipboard&vim
+  bwipe!
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab
diff --git a/src/winclip.c b/src/winclip.c
index 767bf1c71e0..db88e6787df 100644
--- a/src/winclip.c
+++ b/src/winclip.c
@@ -422,7 +422,7 @@ clip_mch_request_selection(Clipboard_T *cbd)
        }
     }
 
-    if (str != NULL && *str != NUL)
+    if (str != NULL && metadata.txtlen != 0)
     {
        char_u *temp_clipboard;
 
@@ -543,7 +543,7 @@ clip_mch_set_selection(Clipboard_T *cbd)
 
        if (lpszMem)
        {
-           vim_strncpy((char_u *)lpszMem, str, metadata.txtlen);
+           mch_memmove((char_u *)lpszMem, str, metadata.txtlen);
            GlobalUnlock(hMem);
        }
     }

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