patch 8.2.0845: text properties crossing lines not handled correctly

Problem:    Text properties crossing lines not handled correctly.
Solution:   When joining lines merge text properties if possible.
            (Axel Forsman, closes #5839, closes #5683)
diff --git a/src/version.c b/src/version.c
index 2a33137..16dfa27 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    845,
+/**/
     844,
 /**/
     843,