patch 8.0.1706: cannot sent CTRL-\ to a terminal window

Problem:    Cannot sent CTRL-\ to a terminal window.
Solution:   Make CTRL-W CTRL-\ send CTRL-\ to a terminal window.
diff --git a/runtime/doc/terminal.txt b/runtime/doc/terminal.txt
index 551a374..63217c2 100644
--- a/runtime/doc/terminal.txt
+++ b/runtime/doc/terminal.txt
@@ -72,6 +72,7 @@
 
 Special in the terminal window:			*CTRL-W_.*  *CTRL-W_N* 
 	CTRL-W .	send a CTRL-W to the job in the terminal
+	CTRL-W CTRL-\	send a CTRL-\ to the job in the terminal
 	CTRL-W N	go to Terminal-Normal mode, see |Terminal-mode|
 	CTRL-\ CTRL-N   go to Terminal-Normal mode, see |Terminal-mode|
 	CTRL-W " {reg}  paste register {reg}		*CTRL-W_quote*
diff --git a/src/terminal.c b/src/terminal.c
index 9a62edd..f980a09 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -2056,6 +2056,11 @@
 		/* "CTRL-W .": send CTRL-W to the job */
 		c = Ctrl_W;
 	    }
+	    else if (termkey == 0 && c == Ctrl_BSL)
+	    {
+		/* "CTRL-W CTRL-\": send CTRL-\ to the job */
+		c = Ctrl_BSL;
+	    }
 	    else if (c == 'N')
 	    {
 		/* CTRL-W N : go to Terminal-Normal mode. */
@@ -2173,7 +2178,7 @@
 	    case  2: return lookup_color( 4, fg, boldp) + 1; /* dark red */
 	    case  3: return lookup_color( 2, fg, boldp) + 1; /* dark green */
 	    case  4: return lookup_color( 6, fg, boldp) + 1; /* brown */
-	    case  5: return lookup_color( 1, fg, boldp) + 1; /* dark blue*/
+	    case  5: return lookup_color( 1, fg, boldp) + 1; /* dark blue */
 	    case  6: return lookup_color( 5, fg, boldp) + 1; /* dark magenta */
 	    case  7: return lookup_color( 3, fg, boldp) + 1; /* dark cyan */
 	    case  8: return lookup_color( 8, fg, boldp) + 1; /* light grey */
diff --git a/src/version.c b/src/version.c
index 6c3b38d..4cba818 100644
--- a/src/version.c
+++ b/src/version.c
@@ -763,6 +763,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1706,
+/**/
     1705,
 /**/
     1704,