Have Esc dismiss userinfo popover.

It's possible that the three places we can kill a popover
(body click, Esc, clicking on a new one) should be
refactored to use the same code.

(imported from commit ba7eab480fd2258abfb469c8f1155f29bc63f7f6)

tools/jslint/check-all.js

@@ -36,6 +36,7 @@ var globals =
     + ' register_onclick hide_email show_email'
     + ' report_error report_success report_message clicking mouse_moved'
     + ' update_autocomplete autocomplete_needs_update'
+    + ' userinfo_currently_popped'
 
     // zephyr.js
     + ' message_array message_dict get_updates_params'

zephyr/static/js/hotkey.js

@@ -91,8 +91,11 @@ function process_hotkey(code) {
             select_message(rows.last_visible(), {then_scroll: false});
         }
         return false;
-    case 27: // Esc: cancel compose or un-narrow
-        if (compose.composing()) {
+    case 27: // Esc: close userinfo popup, cancel compose, or un-narrow
+        if (userinfo_currently_popped !== undefined) {
+            userinfo_currently_popped.popover("destroy");
+            userinfo_currently_popped = undefined;
+        } else if (compose.composing()) {
             compose.cancel();
         } else {
             narrow.show_all_messages();

zephyr/static/js/ui.js

@@ -256,6 +256,7 @@ function userinfo_popover(event, element, id) {
         // One popover at a time.
         if (userinfo_currently_popped) {
             userinfo_currently_popped.popover("destroy");
+            userinfo_currently_popped = undefined;
         }
         var message = message_dict[id];
         elt.popover({placement: "bottom",