Tab should toggle stream/huddle even if you clicked the compose botton.

(imported from commit a705c7cd0d6067dc05da7a64f29fb3ef42838785)

tools/jslint/check-all.js

@@ -21,6 +21,7 @@ var globals =
 
     // hotkey.js
     + ' process_goto_hotkey process_compose_hotkey process_key_in_input'
+    + ' set_compose_hotkey'
 
     // narrow.js
     + ' narrow_target_message_id narrowed show_all_messages'

zephyr/static/js/compose.js

@@ -23,6 +23,7 @@ function compose_button(tabname) {
     clear_compose_box();
     $('#sidebar a[href="#home"]').tab('show');
     show_compose(tabname, $("#" + tabname));
+    set_compose_hotkey();
 }
 
 function toggle_compose() {

zephyr/static/js/hotkey.js

@@ -142,6 +142,10 @@ function process_compose_hotkey(code) {
     return process_hotkey(code);
 }
 
+function set_compose_hotkey() {
+    keydown_handler = process_compose_hotkey;
+}
+
 $(document).keydown(function (e) {
     pressed_keys[e.which] = true;
 });