patch 8.1.0690: setline() and setbufline() do not clear text properties

Problem:    setline() and setbufline() do not clear text properties.
Solution:   Clear text properties when setting the text.

src/evalfunc.c

@@ -1357,8 +1357,10 @@ set_buffer_lines(
 
 	if (!append && lnum <= curbuf->b_ml.ml_line_count)
 	{
-	    /* existing line, replace it */
-	    if (u_savesub(lnum) == OK && ml_replace(lnum, line, TRUE) == OK)
+	    // Existing line, replace it.
+	    // Removes any existing text properties.
+	    if (u_savesub(lnum) == OK && ml_replace_len(
+		      lnum, line, (colnr_T)STRLEN(line) + 1, TRUE, TRUE) == OK)
 	    {
 		changed_bytes(lnum, 0);
 		if (is_curbuf && lnum == curwin->w_cursor.lnum)

src/testdir/test_textprop.vim

@@ -261,6 +261,35 @@ func Test_prop_clear_buf()
   bwipe!
 endfunc
 
+func Test_prop_setline()
+  new
+  call AddPropTypes()
+  call SetupPropsInFirstLine()
+  call assert_equal(s:expected_props, prop_list(1))
+
+  call setline(1, 'foobar')
+  call assert_equal([], prop_list(1))
+
+  call DeletePropTypes()
+  bwipe!
+endfunc
+
+func Test_prop_setbufline()
+  new
+  call AddPropTypes()
+  call SetupPropsInFirstLine()
+  let bufnr = bufnr('')
+  wincmd w
+  call assert_equal(s:expected_props, prop_list(1, {'bufnr': bufnr}))
+
+  call setbufline(bufnr, 1, 'foobar')
+  call assert_equal([], prop_list(1, {'bufnr': bufnr}))
+
+  wincmd w
+  call DeletePropTypes()
+  bwipe!
+endfunc
+
 " Setup a three line prop in lines 2 - 4.
 " Add short props in line 1 and 5.
 func Setup_three_line_prop()

src/version.c

@@ -799,6 +799,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    690,
 /**/
     689,
 /**/