patch 9.1.0185: 'wincolor' hl missing with 'rightleft', "below" virttext, 'nowrap'

Problem:  'wincolor' highlight missing with 'rightleft', "below" virtual
          text and 'nowrap'.
Solution: Handle 'rightleft' in draw_screen_line() (zeertzjq).

closes: #14216

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/dumps/Test_prop_wincolor_9.dump b/src/testdir/dumps/Test_prop_wincolor_9.dump
new file mode 100644
index 0000000..7b26974
--- /dev/null
+++ b/src/testdir/dumps/Test_prop_wincolor_9.dump
@@ -0,0 +1,8 @@
+| +8&#af5f00255@29| +8&#ffd7d7255| +8&#af5f00255@1> @12|e|r|e|h| |t|x|e|t| |e|m|o|s
+| @51|W+8&#5fd7ff255|O|L|E|B| +8&#af5f00255@2
+| +0&#ffd7ff255@29| +0&#ffd7d7255| +0&#ffd7ff255@1| +0&#e0e0e08|e+0&#ffd7ff255|r|e|h| |t|x|e|t| |r|e|g|n|o|l| |h|c|u|m| |e|m|o|s
+| @29| +0&#ffd7d7255| +0&#ffd7ff255@1| +0&#e0e0e08| +0&#ffd7ff255@3|R+0&#ffff4012|E|T|F|A| +0&#ffd7ff255@2|e|r|e|h| |t|x|e|t| |e|r|o|m
+| +0#4040ff13&@58|~
+| @58|~
+| @58|~
+|:+0#0000000#ffffff0| @40|1|,|1|5|-|2|7| @6|A|l@1| 
diff --git a/src/testdir/test_textprop.vim b/src/testdir/test_textprop.vim
index 993a64d..c88b547 100644
--- a/src/testdir/test_textprop.vim
+++ b/src/testdir/test_textprop.vim
@@ -4535,6 +4535,11 @@
   call term_sendkeys(buf, 'k')
   call VerifyScreenDump(buf, 'Test_prop_wincolor_8', {})
 
+  if has('rightleft')
+    call term_sendkeys(buf, ":set rightleft\<CR>:\<CR>")
+    call VerifyScreenDump(buf, 'Test_prop_wincolor_9', {})
+  endif
+
   call StopVimInTerminal(buf)
 endfunc