Implement a new system to handle "escape actions"

The new EscapeActions object decide what to do when the user press the
Escape key (such as closing a opened popup or inlined form).

This commit also re-introduced the sidebar current view as a sidebar
component local state.

client/components/main/editor.js

@@ -1,5 +1,9 @@
-Template.editor.rendered = function() {
-  this.$('textarea').textcomplete([
+var dropdownMenuIsOpened = false;
+
+Template.editor.onRendered(function() {
+  var $textarea = this.$('textarea');
+
+  $textarea.textcomplete([
     // Emojies
     {
       match: /\B:([\-+\w]*)$/,
@@ -37,4 +41,26 @@ Template.editor.rendered = function() {
       index: 1
     }
   ]);
-};
+
+  // Since commit d474017 jquery-textComplete automatically closes a potential
+  // opened dropdown menu when the user press Escape. This behavior conflicts
+  // with our EscapeActions system, but it's too complicated and hacky to
+  // monkey-pach textComplete to disable it -- I tried. Instead we listen to
+  // 'open' and 'hide' events, and create a ghost escapeAction when the dropdown
+  // is opened (and rely on textComplete to execute the actual action).
+  $textarea.on({
+    'textComplete:show': function() {
+      dropdownMenuIsOpened = true;
+    },
+    'textComplete:hide': function() {
+      Tracker.afterFlush(function() {
+        dropdownMenuIsOpened = false;
+      });
+    }
+  });
+});
+
+EscapeActions.register(10,
+  function() { return dropdownMenuIsOpened; },
+  function() {}
+);

client/components/main/events.js

@@ -1,8 +0,0 @@
-Template.editor.events({
-  // Pressing Ctrl+Enter should submit the form.
-  'keydown textarea': function(event) {
-    if (event.keyCode === 13 && (event.metaKey || event.ctrlKey)) {
-      $(event.currentTarget).parents('form:first').submit();
-    }
-  }
-});

client/components/main/templates.html

@@ -12,7 +12,7 @@
 </template>
 
 <template name="editor">
-    <textarea class="{{class}}" placeholder="{{_ 'comment-placeholder'}}" id="{{id}}" tabindex="1">{{> UI.contentBlock }}</textarea>
+    <textarea class="{{class}}" placeholder="{{_ 'comment-placeholder'}}" id="{{id}}" autofocus="{{autofocus}}">{{> UI.contentBlock}}</textarea>
 </template>
 
 <template name="viewer">{{#markdown}}{{#emoji}}{{#mentions}}{{> UI.contentBlock }}{{/mentions}}{{/emoji}}{{/markdown}}</template>