bindings: make a key defined as string work also in browser and viewer

src/browser.c

@@ -303,6 +303,10 @@ char *do_browser(char *path)
 			/* Try opening and reading the selected directory. */
 			path = mallocstrcpy(path, filelist[selected]);
 			goto read_directory_contents;
+#ifdef ENABLE_NANORC
+		} else if (func == (void *)implant) {
+			implant(first_sc_for(MBROWSER, func)->expansion);
+#endif
 		} else if (func == do_exit) {
 			/* Exit from the file browser. */
 			break;

src/help.c

@@ -215,6 +215,10 @@ void do_help(void)
 			do_findprevious();
 		} else if (func == do_findnext) {
 			do_findnext();
+#ifdef ENABLE_NANORC
+		} else if (func == (void *)implant) {
+			implant(first_sc_for(MHELP, func)->expansion);
+#endif
 		} else if (kbinput == KEY_WINCH) {
 			; /* Nothing to do. */
 #endif

src/rcfile.c

@@ -458,7 +458,7 @@ void parse_binding(char *ptr, bool dobind)
 
 		/* Now limit the given menu to those where the function exists. */
 		if (is_universal(newsc->func))
-			menu = menu & MMOST;
+			menu = menu & (MMOST | (newsc->func == (void *)implant ? MHELP : 0));
 		else
 			menu = menu & mask;