Incremental search in copy mode (on for emacs keys by default) - much

the same as normal searching but updates the cursor position and marked
search terms as you type. C-r and C-s in the prompt repeat the search,
once finished searching (with Enter), N and n work as before.

cmd.c

@@ -692,7 +692,7 @@ cmd_template_replace(const char *template, const char *s, int idx)
 
 			buf = xrealloc(buf, len + (strlen(s) * 2) + 1);
 			for (cp = s; *cp != '\0'; cp++) {
-				if (quoted && *cp == '"')
+				if (quoted && (*cp == '"' || *cp == '$'))
 					buf[len++] = '\\';
 				buf[len++] = *cp;
 			}