patch 8.2.1556: cursorline highlighting always overrules sign highlighting

Problem:    Cursorline highlighting always overrules sign highlighting.
Solution:   Combine the highlighting, use the priority to decide how.
            (closes #6812)
diff --git a/runtime/doc/sign.txt b/runtime/doc/sign.txt
index 1e88a62..46cb9b5 100644
--- a/runtime/doc/sign.txt
+++ b/runtime/doc/sign.txt
@@ -1,4 +1,4 @@
-*sign.txt*      For Vim version 8.2.  Last change: 2019 Nov 30
+*sign.txt*      For Vim version 8.2.  Last change: 2020 Aug 31
 
 
 		  VIM REFERENCE MANUAL    by Gordon Prieur
@@ -85,6 +85,10 @@
 next line (or the last line of the buffer, if there is no next line).  When
 the delete is undone the sign does not move back.
 
+When a sign with line highlighting and 'cursorline' highlighting are both
+present, if the priority is 100 or more then the sign highlighting takes
+precedence, otherwise the 'cursorline' highlighting.
+
 ==============================================================================
 2. Commands					*sign-commands* *:sig* *:sign*
 
diff --git a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
index 6680b48..832dcf5 100644
--- a/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
+++ b/runtime/pack/dist/opt/termdebug/plugin/termdebug.vim
@@ -2,7 +2,7 @@
 "
 " Author: Bram Moolenaar
 " Copyright: Vim license applies, see ":help license"
-" Last Change: 2020 Jul 12
+" Last Change: 2020 Aug 31
 "
 " WORK IN PROGRESS - Only the basics work
 " Note: On MS-Windows you need a recent version of gdb.  The one included with
@@ -937,7 +937,7 @@
       endif
       exe lnum
       exe 'sign unplace ' . s:pc_id
-      exe 'sign place ' . s:pc_id . ' line=' . lnum . ' name=debugPC file=' . fname
+      exe 'sign place ' . s:pc_id . ' line=' . lnum . ' name=debugPC priority=110 file=' . fname
       setlocal signcolumn=yes
     endif
   elseif !s:stopped || fname != ''