patch 9.0.1306: no regression test for solved problem of #11959

Problem:    No regression test for solved problem of #11959.
Solution:   Add a test, also with 'list' set. (closes #11959)

src/testdir/dumps/Test_prop_above_empty_2.dump

@@ -0,0 +1,16 @@
+| +0#af5f00255#ffffff0@3|-+0#0000001#ffff4012@2| +0#0000000#ffffff0@52
+| +0#af5f00255&@1|1| |1+0#0000000&@7|$+0#4040ff13&| +0#0000000&@46
+| +0#af5f00255&@3|-+0#0000001#ffff4012@2| +0#0000000#ffffff0@52
+| +0#af5f00255&@1|2| |$+0#4040ff13&| +0#0000000&@54
+| +0#af5f00255&@3|-+0#0000001#ffff4012@2| +0#0000000#ffffff0@52
+| +0#af5f00255&@1|3| |3+0#0000000&@8|$+0#4040ff13&| +0#0000000&@45
+| +0#af5f00255&@3|-+0#0000001#ffff4012@2| +0#0000000#ffffff0@52
+| +0#af5f00255&@1|4| |$+0#4040ff13&| +0#0000000&@54
+| +0#af5f00255&@3|-+0#0000001#ffff4012@2| +0#0000000#ffffff0@52
+| +0#af5f00255&@1|5| >5+0#0000000&@10|$+0#4040ff13&| +0#0000000&@43
+|~+0#4040ff13&| @58
+|~| @58
+|~| @58
+|~| @58
+|~| @58
+|:+0#0000000&|s|e|t| |l|i|s|t| @32|5|,|1|-|5|7| @7|A|l@1| 

src/testdir/test_textprop.vim

@@ -2804,6 +2804,31 @@ func Test_prop_with_text_above_below_empty()
   call StopVimInTerminal(buf)
 endfunc
 
+func Test_prop_with_text_above_empty()
+  CheckRunVimInTerminal
+
+  " check the cursor is in the correct line
+  let lines =<< trim END
+      setlocal number
+      call setline(1, ['11111111', '', '333333333', '', '55555555555'])
+
+      let vt = 'test'
+      call prop_type_add(vt, {'highlight': 'ToDo'})
+      for ln in range(1, line('$'))
+        call prop_add(ln, 0, {'type': vt, 'text': '---', 'text_align': 'above'})
+      endfor
+      normal G
+  END
+  call writefile(lines, 'XscriptPropAboveEmpty', 'D')
+  let buf = RunVimInTerminal('-S XscriptPropAboveEmpty', #{rows: 16, cols: 60})
+  call VerifyScreenDump(buf, 'Test_prop_above_empty_1', {})
+
+  call term_sendkeys(buf, ":set list\<CR>")
+  call VerifyScreenDump(buf, 'Test_prop_above_empty_2', {})
+
+  call StopVimInTerminal(buf)
+endfunc
+
 func Test_prop_with_text_below_after_match()
   CheckRunVimInTerminal
 

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1306,
 /**/
     1305,
 /**/