patch 9.0.0464: with virtual text "above" indenting doesn't work well

Problem:    With virtual text "above" indenting doesn't work well.
Solution:   Ignore text properties while adjusting indent. (issue #11084)
diff --git a/src/globals.h b/src/globals.h
index 3d75e20..5218324 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -755,6 +755,9 @@
 EXTERN int	popup_uses_mouse_move INIT(= FALSE);
 
 EXTERN int	text_prop_frozen INIT(= 0);
+
+// when TRUE computing the cursor position ignores text properties.
+EXTERN int	ignore_text_props INIT(= FALSE);
 #endif
 
 // When set the popup menu will redraw soon using the pum_win_ values. Do not