FIX: Do not trigger fullpage search when selecting autocomplete term with enter.

app/assets/javascripts/discourse/lib/autocomplete.js.es6

@@ -240,6 +240,7 @@ export default function(options) {
     var pos = null;
     var vOffset = 0;
     var hOffset = 0;
+
     if (isInput) {
       pos = {
         left: 0,
@@ -247,19 +248,14 @@ export default function(options) {
       };
       vOffset = -32;
       hOffset = 0;
-    } if (options.treatAsTextarea) {
-      pos = me.caretPosition({
-        pos: completeStart,
-        key: options.key
-      });
-      hOffset = 27;
-      vOffset = -32;
     } else {
       pos = me.caretPosition({
         pos: completeStart,
         key: options.key
       });
+
       hOffset = 27;
+      if (options.treatAsTextarea) vOffset = -32;
     }
     div.css({
       left: "-1000px"

app/assets/javascripts/discourse/lib/search.js.es6

@@ -130,7 +130,13 @@ export function isValidSearchTerm(searchTerm) {
   }
 };
 
-export function applySearchAutocomplete($input, siteSettings) {
+export function applySearchAutocomplete($input, siteSettings, appEvents) {
+  const afterComplete = function() {
+    if (appEvents) {
+      appEvents.trigger("search-autocomplete:after-complete");
+    }
+  };
+
   $input.autocomplete({
     template: findRawTemplate('category-tag-autocomplete'),
     key: '#',
@@ -145,15 +151,17 @@ export function applySearchAutocomplete($input, siteSettings) {
     },
     dataSource(term) {
       return searchCategoryTag(term, siteSettings);
-    }
+    },
+    afterComplete
   });
 
   $input.autocomplete({
     template: findRawTemplate('user-selector-autocomplete'),
-    dataSource: term => userSearch({ term, undefined, includeGroups: true }),
     key: "@",
     width: '100%',
     treatAsTextarea: true,
-    transformComplete: v => v.username || v.name
+    transformComplete: v => v.username || v.name,
+    dataSource: term => userSearch({ term, includeGroups: true }),
+    afterComplete
   });
 };

app/assets/javascripts/discourse/widgets/header.js.es6

@@ -262,7 +262,7 @@ export default createWidget('header', {
       Ember.run.schedule('afterRender', () => {
         const $searchInput = $('#search-term');
         $searchInput.focus().select();
-        applySearchAutocomplete($searchInput, this.siteSettings);
+        applySearchAutocomplete($searchInput, this.siteSettings, this.appEvents);
       });
     }
   },

app/assets/javascripts/discourse/widgets/search-menu-controls.js.es6

@@ -6,11 +6,13 @@ createWidget('search-term', {
   tagName: 'input',
   buildId: () => 'search-term',
   buildKey: (attrs) => `search-term-${attrs.id}`,
-  KEYCODE_AT_SIGN: 50,
-  KEYCODE_POUND_SIGN: 51,
 
   defaultState() {
-    return { autocompleteIsOpen: false, shiftKeyEntry: false };
+    this.appEvents.on("search-autocomplete:after-complete", () => {
+      this.state.afterAutocomplete = true;
+    });
+
+    return { afterAutocomplete: false };
   },
 
   buildAttributes(attrs) {
@@ -19,22 +21,13 @@ createWidget('search-term', {
              placeholder: attrs.contextEnabled ? "" : I18n.t('search.title') };
   },
 
-  keyDown(e) {
-    const state = this.state;
-    state.shiftKeyEntry = e.shiftKey &&
-      (e.keyCode === this.KEYCODE_AT_SIGN || e.keyCode === this.KEYCODE_POUND_SIGN);
-
-    if ($(`#${this.buildId()}`).parent().find('.autocomplete').length !== 0) {
-      state.autocompleteIsOpen = true;
-    } else  {
-      state.autocompleteIsOpen = false;
-    }
-  },
-
   keyUp(e) {
-    const state = this.state;
-    if (e.which === 13 && !state.shiftKeyEntry && !state.autocompleteIsOpen) {
-      return this.sendWidgetAction('fullSearch');
+    if (e.which === 13) {
+      if (this.state.afterAutocomplete) {
+        this.state.afterAutocomplete = false;
+      } else {
+        return this.sendWidgetAction('fullSearch');
+      }
     }
 
     const val = this.attrs.value;