patch 9.0.0784: text prop "above" not right with 'number' and "n" in 'cpo'

Problem:    Text prop "above" not displayed correctly with 'number' and "n" in
            'cpo'.
Solution:   Draw the line number column until the line text is reached.

src/drawline.c

@@ -343,9 +343,14 @@ handle_lnum_col(
 	int		num_attr UNUSED)
 {
     int has_cpo_n = vim_strchr(p_cpo, CPO_NUMCOL) != NULL;
+    int lnum_row = wlv->startrow + wlv->filler_lines
+#ifdef FEAT_PROP_POPUP
+		      + wlv->text_prop_above_count
+#endif
+		      ;
 
     if ((wp->w_p_nu || wp->w_p_rnu)
-	     && (wlv->row == wlv->startrow + wlv->filler_lines || !has_cpo_n)
+	     && (wlv->row <= lnum_row || !has_cpo_n)
 	     // there is no line number in a wrapped line when "n" is in
 	     // 'cpoptions', but 'breakindent' assumes it anyway.
 	     && !((has_cpo_n
@@ -366,10 +371,7 @@ handle_lnum_col(
 	  // Draw the line number (empty space after wrapping).
 	  // When there are text properties above the line put the line number
 	  // below them.
-	  if (wlv->row == wlv->startrow + wlv->filler_lines
-#ifdef FEAT_PROP_POPUP
-		  + wlv->text_prop_above_count
-#endif
+	  if (wlv->row == lnum_row
 		    && (wp->w_skipcol == 0 || wlv->row > wp->w_winrow
 					       || (wp->w_p_nu && wp->w_p_rnu)))
 	  {
@@ -1695,6 +1697,8 @@ win_line(
 	    {
 		area_highlighting = TRUE;
 		extra_check = TRUE;
+		// text props "above" move the line number down to where the
+		// text is.
 		for (int i = 0; i < text_prop_count; ++i)
 		    if (text_props[i].tp_flags & TP_FLAG_ALIGN_ABOVE)
 			++wlv.text_prop_above_count;

src/testdir/dumps/Test_prop_above_number_1.dump

@@ -0,0 +1,8 @@
+| +0#af5f00255#ffffff0@1|1| >o+0#0000000&|n|e| |o|n|e| |o|n|e| @59
+| +0#af5f00255&@3|a+0#0000000#ffd7ff255|b|o|v|e| |t|h|e| |t|e|x|t| +0&#ffffff0@56
+| +0#af5f00255&@1|2| |t+0#0000000&|w|o| |t|w|o| |t|w|o| @59
+| +0#af5f00255&@1|3| |t+0#0000000&|h|r|e@1| |t|h|r|e@1| |t|h|r|e@1| @53
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|,|1| @10|A|l@1| 

src/testdir/dumps/Test_prop_above_number_2.dump

@@ -0,0 +1,8 @@
+| +0#af5f00255#ffffff0@1|1| >o+0#0000000&|n|e| |o|n|e| |o|n|e| @59
+| +0#af5f00255&@3|a+0#0000000#ffd7ff255|b|o|v|e| |t|h|e| |t|e|x|t| +0&#ffffff0@56
+| +0#af5f00255&@3|a+0#0000000#ffd7ff255|l|s|o| |a|b|o|v|e| |t|h|e| |t|e|x|t| +0&#ffffff0@51
+| +0#af5f00255&@1|2| |t+0#0000000&|w|o| |t|w|o| |t|w|o| @59
+| +0#af5f00255&@1|3| |t+0#0000000&|h|r|e@1| |t|h|r|e@1| |t|h|r|e@1| @53
+|~+0#4040ff13&| @73
+|~| @73
+| +0#0000000&@56|1|,|1| @10|A|l@1| 

src/testdir/test_textprop.vim

@@ -2964,6 +2964,37 @@ func Test_prop_above_with_indent()
   call prop_type_delete('indented')
 endfunc
 
+func Test_prop_above_with_number()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+      vim9script
+      setline(1, ['one one one', 'two two two', 'three three three'])
+      set number cpo+=n
+      prop_type_add('test', {highlight: 'DiffChange'})
+      prop_add(2, 0, {
+          text:  'above the text',
+          type: 'test',
+          text_align: 'above',
+      })
+      def g:OneMore()
+        prop_add(2, 0, {
+            text:  'also above the text',
+            type: 'test',
+            text_align: 'above',
+        })
+      enddef
+  END
+  call writefile(lines, 'XscriptPropAboveNr', 'D')
+  let buf = RunVimInTerminal('-S XscriptPropAboveNr', #{rows: 8})
+  call VerifyScreenDump(buf, 'Test_prop_above_number_1', {})
+
+  call term_sendkeys(buf, ":call OneMore()\<CR>")
+  call VerifyScreenDump(buf, 'Test_prop_above_number_2', {})
+
+  call StopVimInTerminal(buf)
+endfunc
+
 func Test_prop_below_split_line()
   CheckRunVimInTerminal
 

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    784,
 /**/
     783,
 /**/