PLT-3114 Moved preview collapse out of pre-release features (#3206)

* Added user setting to auto collapse image previews

* Added slash commands for collapsing/expanding image previews

* Added translation strings for collapse setting

* Add default props for preview collapse setting

api/command_expand_collapse.go

@@ -0,0 +1,77 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package api
+
+import (
+	"github.com/mattermost/platform/model"
+)
+
+type ExpandProvider struct {
+}
+
+type CollapseProvider struct {
+}
+
+const (
+	CMD_EXPAND   = "expand"
+	CMD_COLLAPSE = "collapse"
+)
+
+func init() {
+	RegisterCommandProvider(&ExpandProvider{})
+	RegisterCommandProvider(&CollapseProvider{})
+}
+
+func (me *ExpandProvider) GetTrigger() string {
+	return CMD_EXPAND
+}
+
+func (me *CollapseProvider) GetTrigger() string {
+	return CMD_COLLAPSE
+}
+
+func (me *ExpandProvider) GetCommand(c *Context) *model.Command {
+	return &model.Command{
+		Trigger:          CMD_EXPAND,
+		AutoComplete:     true,
+		AutoCompleteDesc: c.T("api.command_expand.desc"),
+		DisplayName:      c.T("api.command_expand.name"),
+	}
+}
+
+func (me *CollapseProvider) GetCommand(c *Context) *model.Command {
+	return &model.Command{
+		Trigger:          CMD_COLLAPSE,
+		AutoComplete:     true,
+		AutoCompleteDesc: c.T("api.command_collapse.desc"),
+		DisplayName:      c.T("api.command_collapse.name"),
+	}
+}
+
+func (me *ExpandProvider) DoCommand(c *Context, channelId string, message string) *model.CommandResponse {
+	return setCollapsePreference(c, "false")
+}
+
+func (me *CollapseProvider) DoCommand(c *Context, channelId string, message string) *model.CommandResponse {
+	return setCollapsePreference(c, "true")
+}
+
+func setCollapsePreference(c *Context, value string) *model.CommandResponse {
+	pref := model.Preference{
+		UserId:   c.Session.UserId,
+		Category: model.PREFERENCE_CATEGORY_DISPLAY_SETTINGS,
+		Name:     model.PREFERENCE_NAME_COLLAPSE_SETTING,
+		Value:    value,
+	}
+
+	if result := <-Srv.Store.Preference().Save(&model.Preferences{pref}); result.Err != nil {
+		return &model.CommandResponse{Text: c.T("api.command_expand_collapse.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	socketMessage := model.NewMessage("", "", c.Session.UserId, model.ACTION_PREFERENCE_CHANGED)
+	socketMessage.Add("preference", pref.ToJson())
+	go Publish(socketMessage)
+
+	return &model.CommandResponse{}
+}

api/command_expand_collapse_test.go

@@ -0,0 +1,47 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package api
+
+import (
+	"testing"
+	"time"
+
+	"github.com/mattermost/platform/model"
+)
+
+func TestExpandCommand(t *testing.T) {
+	th := Setup().InitBasic()
+	Client := th.BasicClient
+	channel := th.BasicChannel
+
+	r1 := Client.Must(Client.Command(channel.Id, "/expand", false)).Data.(*model.CommandResponse)
+	if r1 == nil {
+		t.Fatal("Command failed to execute")
+	}
+
+	time.Sleep(100 * time.Millisecond)
+
+	p1 := Client.Must(Client.GetPreference(model.PREFERENCE_CATEGORY_DISPLAY_SETTINGS, model.PREFERENCE_NAME_COLLAPSE_SETTING)).Data.(*model.Preference)
+	if p1.Value != "false" {
+		t.Fatal("preference not updated correctly")
+	}
+}
+
+func TestCollapseCommand(t *testing.T) {
+	th := Setup().InitBasic()
+	Client := th.BasicClient
+	channel := th.BasicChannel
+
+	r1 := Client.Must(Client.Command(channel.Id, "/collapse", false)).Data.(*model.CommandResponse)
+	if r1 == nil {
+		t.Fatal("Command failed to execute")
+	}
+
+	time.Sleep(100 * time.Millisecond)
+
+	p1 := Client.Must(Client.GetPreference(model.PREFERENCE_CATEGORY_DISPLAY_SETTINGS, model.PREFERENCE_NAME_COLLAPSE_SETTING)).Data.(*model.Preference)
+	if p1.Value != "true" {
+		t.Fatal("preference not updated correctly")
+	}
+}

i18n/en.json

@@ -399,6 +399,26 @@
     "id": "api.command_echo.name",
     "translation": "echo"
   },
+  {
+    "id": "api.command_collapse.desc",
+    "translation": "Turn on auto-collapsing of image previews"
+  },
+  {
+    "id": "api.command_collapse.name",
+    "translation": "collapse"
+  },
+  {
+    "id": "api.command_expand.desc",
+    "translation": "Turn off auto-collapsing of image previews"
+  },
+  {
+    "id": "api.command_expand_collapse.fail.app_error",
+    "translation": "An error occured while expanding previews"
+  },
+  {
+    "id": "api.command_expand.name",
+    "translation": "expand"
+  },
   {
     "id": "api.command_join.desc",
     "translation": "Join the open channel"

model/preference.go

@@ -14,6 +14,9 @@ const (
 	PREFERENCE_CATEGORY_TUTORIAL_STEPS      = "tutorial_step"
 	PREFERENCE_CATEGORY_ADVANCED_SETTINGS   = "advanced_settings"
 
+	PREFERENCE_CATEGORY_DISPLAY_SETTINGS = "display_settings"
+	PREFERENCE_NAME_COLLAPSE_SETTING     = "collapse_previews"
+
 	PREFERENCE_CATEGORY_LAST     = "last"
 	PREFERENCE_NAME_LAST_CHANNEL = "channel"
 )

webapp/components/post_view/components/post.jsx

@@ -72,6 +72,10 @@ export default class Post extends React.Component {
             return true;
         }
 
+        if (nextProps.previewCollapsed !== this.props.previewCollapsed) {
+            return true;
+        }
+
         if (!Utils.areObjectsEqual(nextProps.user, this.props.user)) {
             return true;
         }
@@ -190,6 +194,7 @@ export default class Post extends React.Component {
                                 parentPost={parentPost}
                                 handleCommentClick={this.handleCommentClick}
                                 compactDisplay={this.props.compactDisplay}
+                                previewCollapsed={this.props.previewCollapsed}
                             />
                         </div>
                     </div>
@@ -213,5 +218,6 @@ Post.propTypes = {
     currentUser: React.PropTypes.object.isRequired,
     center: React.PropTypes.bool,
     compactDisplay: React.PropTypes.bool,
+    previewCollapsed: React.PropTypes.string,
     commentCount: React.PropTypes.number
 };

webapp/components/post_view/components/post_body.jsx

@@ -25,7 +25,11 @@ export default class PostBody extends React.Component {
             return true;
         }
 
-        if (!Utils.areObjectsEqual(nextProps.compactDisplay, this.props.compactDisplay)) {
+        if (nextProps.compactDisplay !== this.props.compactDisplay) {
+            return true;
+        }
+
+        if (nextProps.previewCollapsed !== this.props.previewCollapsed) {
             return true;
         }
 
@@ -172,6 +176,7 @@ export default class PostBody extends React.Component {
                     post={this.props.post}
                     message={messageWrapper}
                     compactDisplay={this.props.compactDisplay}
+                    previewCollapsed={this.props.previewCollapsed}
                 />
             );
         }
@@ -193,5 +198,6 @@ PostBody.propTypes = {
     parentPost: React.PropTypes.object,
     retryPost: React.PropTypes.func.isRequired,
     handleCommentClick: React.PropTypes.func.isRequired,
-    compactDisplay: React.PropTypes.bool
+    compactDisplay: React.PropTypes.bool,
+    previewCollapsed: React.PropTypes.string
 };

webapp/components/post_view/components/post_body_additional_content.jsx

@@ -22,10 +22,14 @@ export default class PostBodyAdditionalContent extends React.Component {
         this.toggleEmbedVisibility = this.toggleEmbedVisibility.bind(this);
 
         this.state = {
-            embedVisible: true
+            embedVisible: props.previewCollapsed.startsWith('false')
         };
     }
 
+    componentWillReceiveProps(nextProps) {
+        this.setState({embedVisible: nextProps.previewCollapsed.startsWith('false')});
+    }
+
     shouldComponentUpdate(nextProps, nextState) {
         if (!Utils.areObjectsEqual(nextProps.post, this.props.post)) {
             return true;
@@ -118,7 +122,7 @@ export default class PostBodyAdditionalContent extends React.Component {
 
         if (generateEmbed) {
             let messageWithToggle = [];
-            if (Utils.isFeatureEnabled(Constants.PRE_RELEASE_FEATURES.EMBED_TOGGLE)) {
+
             // if message has only one line and starts with a link place toggle in this only line
             // else - place it in new line between message and embed
             const prependToggle = (/^\s*https?:\/\/.*$/).test(this.props.post.message);
@@ -130,14 +134,12 @@ export default class PostBodyAdditionalContent extends React.Component {
                     onClick={this.toggleEmbedVisibility}
                 />
             );
+
             if (prependToggle) {
                 messageWithToggle.push(this.props.message);
             } else {
                 messageWithToggle.unshift(this.props.message);
             }
-            } else {
-                messageWithToggle.push(this.props.message);
-            }
 
             return (
                 <div>
@@ -156,8 +158,12 @@ export default class PostBodyAdditionalContent extends React.Component {
     }
 }
 
+PostBodyAdditionalContent.defaultProps = {
+    previewCollapsed: 'false'
+};
 PostBodyAdditionalContent.propTypes = {
     post: React.PropTypes.object.isRequired,
+    message: React.PropTypes.element.isRequired,
     compactDisplay: React.PropTypes.bool,
-    message: React.PropTypes.element.isRequired
+    previewCollapsed: React.PropTypes.string
 };

webapp/components/post_view/components/post_list.jsx

@@ -260,6 +260,7 @@ export default class PostList extends React.Component {
                     center={this.props.displayPostsInCenter}
                     commentCount={commentCount}
                     compactDisplay={this.props.compactDisplay}
+                    previewCollapsed={this.props.previewsCollapsed}
                 />
             );
 
@@ -520,5 +521,6 @@ PostList.propTypes = {
     postsToHighlight: React.PropTypes.object,
     displayNameType: React.PropTypes.string,
     displayPostsInCenter: React.PropTypes.bool,
-    compactDisplay: React.PropTypes.bool
+    compactDisplay: React.PropTypes.bool,
+    previewsCollapsed: React.PropTypes.string
 };

webapp/components/post_view/post_view_controller.jsx

@@ -51,7 +51,8 @@ export default class PostViewController extends React.Component {
             scrollType: ScrollTypes.NEW_MESSAGE,
             displayNameType: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, 'name_format', 'false'),
             displayPostsInCenter: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.CHANNEL_DISPLAY_MODE, Preferences.CHANNEL_DISPLAY_MODE_DEFAULT) === Preferences.CHANNEL_DISPLAY_MODE_CENTERED,
-            compactDisplay: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.MESSAGE_DISPLAY, Preferences.MESSAGE_DISPLAY_DEFAULT) === Preferences.MESSAGE_DISPLAY_COMPACT
+            compactDisplay: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.MESSAGE_DISPLAY, Preferences.MESSAGE_DISPLAY_DEFAULT) === Preferences.MESSAGE_DISPLAY_COMPACT,
+            previewsCollapsed: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.COLLAPSE_DISPLAY, 'false')
         };
     }
 
@@ -67,11 +68,19 @@ export default class PostViewController extends React.Component {
         }
     }
 
-    onPreferenceChange() {
+    onPreferenceChange(category) {
+        // Bit of a hack to force render when this setting is updated
+        // regardless of change
+        let previewSuffix = '';
+        if (category === Preferences.CATEGORY_DISPLAY_SETTINGS) {
+            previewSuffix = '_' + Utils.generateId();
+        }
+
         this.setState({
             displayNameType: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, 'name_format', 'false'),
             displayPostsInCenter: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.CHANNEL_DISPLAY_MODE, Preferences.CHANNEL_DISPLAY_MODE_DEFAULT) === Preferences.CHANNEL_DISPLAY_MODE_CENTERED,
-            compactDisplay: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.MESSAGE_DISPLAY, Preferences.MESSAGE_DISPLAY_DEFAULT) === Preferences.MESSAGE_DISPLAY_COMPACT
+            compactDisplay: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.MESSAGE_DISPLAY, Preferences.MESSAGE_DISPLAY_DEFAULT) === Preferences.MESSAGE_DISPLAY_COMPACT,
+            previewsCollapsed: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.COLLAPSE_DISPLAY, 'false') + previewSuffix
         });
     }
 
@@ -132,6 +141,7 @@ export default class PostViewController extends React.Component {
                 displayNameType: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, 'name_format', 'false'),
                 displayPostsInCenter: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.CHANNEL_DISPLAY_MODE, Preferences.CHANNEL_DISPLAY_MODE_DEFAULT) === Preferences.CHANNEL_DISPLAY_MODE_CENTERED,
                 compactDisplay: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.MESSAGE_DISPLAY, Preferences.MESSAGE_DISPLAY_DEFAULT) === Preferences.MESSAGE_DISPLAY_COMPACT,
+                previewsCollapsed: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.COLLAPSE_DISPLAY, 'false'),
                 scrollType: ScrollTypes.NEW_MESSAGE
             });
         }
@@ -183,6 +193,10 @@ export default class PostViewController extends React.Component {
             return true;
         }
 
+        if (nextState.previewsCollapsed !== this.state.previewsCollapsed) {
+            return true;
+        }
+
         if (nextState.lastViewed !== this.state.lastViewed) {
             return true;
         }
@@ -241,6 +255,7 @@ export default class PostViewController extends React.Component {
                     displayNameType={this.state.displayNameType}
                     displayPostsInCenter={this.state.displayPostsInCenter}
                     compactDisplay={this.state.compactDisplay}
+                    previewsCollapsed={this.state.previewsCollapsed}
                     lastViewed={this.state.lastViewed}
                 />
             );

webapp/components/user_settings/user_settings_advanced.jsx

@@ -234,13 +234,6 @@ export default class AdvancedSettingsDisplay extends React.Component {
                     defaultMessage='Show preview snippet of links below message'
                 />
             );
-        case 'EMBED_TOGGLE':
-            return (
-                <FormattedMessage
-                    id='user.settings.advance.embed_toggle'
-                    defaultMessage='Show toggle for all embed previews'
-                />
-            );
         default:
             return null;
         }

webapp/components/user_settings/user_settings_display.jsx

@@ -24,7 +24,8 @@ function getDisplayStateFromStores() {
         nameFormat: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, 'name_format', 'username'),
         selectedFont: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, 'selected_font', Constants.DEFAULT_FONT),
         channelDisplayMode: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.CHANNEL_DISPLAY_MODE, Preferences.CHANNEL_DISPLAY_MODE_DEFAULT),
-        messageDisplay: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.MESSAGE_DISPLAY, Preferences.MESSAGE_DISPLAY_DEFAULT)
+        messageDisplay: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.MESSAGE_DISPLAY, Preferences.MESSAGE_DISPLAY_DEFAULT),
+        collapseDisplay: PreferenceStore.get(Preferences.CATEGORY_DISPLAY_SETTINGS, Preferences.COLLAPSE_DISPLAY, Preferences.COLLAPSE_DISPLAY_DEFAULT)
     };
 }
 
@@ -41,9 +42,11 @@ export default class UserSettingsDisplay extends React.Component {
         this.updateSection = this.updateSection.bind(this);
         this.updateState = this.updateState.bind(this);
         this.deactivate = this.deactivate.bind(this);
+        this.createCollapseSection = this.createCollapseSection.bind(this);
 
         this.state = getDisplayStateFromStores();
     }
+
     handleSubmit() {
         const userId = UserStore.getCurrentId();
 
@@ -77,8 +80,14 @@ export default class UserSettingsDisplay extends React.Component {
             name: Preferences.MESSAGE_DISPLAY,
             value: this.state.messageDisplay
         };
+        const collapseDisplayPreference = {
+            user_id: userId,
+            category: Preferences.CATEGORY_DISPLAY_SETTINGS,
+            name: Preferences.COLLAPSE_DISPLAY,
+            value: this.state.collapseDisplay
+        };
 
-        AsyncClient.savePreferences([timePreference, namePreference, fontPreference, channelDisplayModePreference, messageDisplayPreference],
+        AsyncClient.savePreferences([timePreference, namePreference, fontPreference, channelDisplayModePreference, messageDisplayPreference, collapseDisplayPreference],
             () => {
                 this.updateSection('');
             },
@@ -87,27 +96,38 @@ export default class UserSettingsDisplay extends React.Component {
             }
         );
     }
+
     handleClockRadio(militaryTime) {
         this.setState({militaryTime});
     }
+
     handleNameRadio(nameFormat) {
         this.setState({nameFormat});
     }
+
     handleChannelDisplayModeRadio(channelDisplayMode) {
         this.setState({channelDisplayMode});
     }
+
     handlemessageDisplayRadio(messageDisplay) {
         this.setState({messageDisplay});
     }
+
     handleFont(selectedFont) {
         Utils.applyFont(selectedFont);
         this.setState({selectedFont});
     }
+
+    handleCollapseRadio(collapseDisplay) {
+        this.setState({collapseDisplay});
+    }
+
     updateSection(section) {
         $('.settings-modal .modal-body').scrollTop(0).perfectScrollbar('update');
         this.updateState();
         this.props.updateSection(section);
     }
+
     updateState() {
         const newState = getDisplayStateFromStores();
         if (!Utils.areObjectsEqual(newState, this.state)) {
@@ -115,9 +135,118 @@ export default class UserSettingsDisplay extends React.Component {
             this.setState(newState);
         }
     }
+
     deactivate() {
         this.updateState();
     }
+
+    createCollapseSection() {
+        if (this.props.activeSection === 'collapse') {
+            const collapseFormat = [false, false];
+            if (this.state.collapseDisplay === 'true') {
+                collapseFormat[0] = true;
+            } else {
+                collapseFormat[1] = true;
+            }
+
+            const handleUpdateCollapseSection = (e) => {
+                this.updateSection('');
+                e.preventDefault();
+            };
+
+            const inputs = [
+                <div key='userDisplayCollapseOptions'>
+                    <div className='radio'>
+                        <label>
+                            <input
+                                type='radio'
+                                name='collapseFormat'
+                                checked={collapseFormat[0]}
+                                onChange={this.handleCollapseRadio.bind(this, 'true')}
+                            />
+                            <FormattedMessage
+                                id='user.settings.display.collapseOn'
+                                defaultMessage='On'
+                            />
+                        </label>
+                        <br/>
+                    </div>
+                    <div className='radio'>
+                        <label>
+                            <input
+                                type='radio'
+                                name='collapseFormat'
+                                checked={collapseFormat[1]}
+                                onChange={this.handleCollapseRadio.bind(this, 'false')}
+                            />
+                            <FormattedMessage
+                                id='user.settings.display.collapseOff'
+                                defaultMessage='Off'
+                            />
+                        </label>
+                        <br/>
+                    </div>
+                    <div>
+                        <br/>
+                        <FormattedMessage
+                            id='user.settings.display.collapseDesc'
+                            defaultMessage='Toggle whether to automatically collapse all image previews.'
+                        />
+                    </div>
+                </div>
+            ];
+
+            return (
+                <SettingItemMax
+                    title={
+                        <FormattedMessage
+                            id='user.settings.display.collapseDisplay'
+                            defaultMessage='Auto Collapse Previews'
+                        />
+                    }
+                    inputs={inputs}
+                    submit={this.handleSubmit}
+                    server_error={this.state.serverError}
+                    updateSection={handleUpdateCollapseSection}
+                />
+            );
+        }
+
+        let describe;
+        if (this.state.collapseDisplay === 'true') {
+            describe = (
+                <FormattedMessage
+                    id='user.settings.display.collapseOn'
+                    defaultMessage='On'
+                />
+            );
+        } else {
+            describe = (
+                <FormattedMessage
+                    id='user.settings.display.collapseOff'
+                    defaultMessage='Off'
+                />
+            );
+        }
+
+        const handleUpdateCollapseSection = () => {
+            this.props.updateSection('collapse');
+        };
+
+        return (
+            <SettingItemMin
+                title={
+                    <FormattedMessage
+                        id='user.settings.display.collapseDisplay'
+                        defaultMessage='Auto Collapse Previews'
+                    />
+                }
+                describe={describe}
+                updateSection={handleUpdateCollapseSection}
+            />
+        );
+    }
+
     render() {
         const serverError = this.state.serverError || null;
         let clockSection;
@@ -127,6 +256,8 @@ export default class UserSettingsDisplay extends React.Component {
         let languagesSection;
         let messageDisplaySection;
 
+        const collapseSection = this.createCollapseSection();
+
         if (this.props.activeSection === 'clock') {
             const clockFormat = [false, false];
             if (this.state.militaryTime === 'true') {
@@ -729,6 +860,8 @@ export default class UserSettingsDisplay extends React.Component {
                     <div className='divider-dark'/>
                     {nameFormatSection}
                     <div className='divider-dark'/>
+                    {collapseSection}
+                    <div className='divider-dark'/>
                     {messageDisplaySection}
                     <div className='divider-dark'/>
                     {channelDisplayModeSection}

webapp/i18n/en.json

@@ -1290,6 +1290,10 @@
   "user.settings.developer.register": "Register New Application",
   "user.settings.developer.thirdParty": "Open to register a new third-party application",
   "user.settings.developer.title": "Developer Settings",
+  "user.settings.display.collapseOn": "On",
+  "user.settings.display.collapseOff": "Off",
+  "user.settings.display.collapseDesc": "Toggle whether to automatically collapse all image previews.",
+  "user.settings.display.collapseDisplay": "Auto Collapse Previews",
   "user.settings.display.channelDisplayTitle": "Channel Display Mode",
   "user.settings.display.channeldisplaymode": "Select the width of the center channel.",
   "user.settings.display.clockDisplay": "Clock Display",

webapp/stores/preference_store.jsx

@@ -82,8 +82,8 @@ class PreferenceStoreClass extends EventEmitter {
         this.preferences.clear();
     }
 
-    emitChange() {
+    emitChange(category) {
-        this.emit(CHANGE_EVENT);
+        this.emit(CHANGE_EVENT, category);
     }
 
     addChangeListener(callback) {
@@ -101,7 +101,7 @@ class PreferenceStoreClass extends EventEmitter {
         case ActionTypes.RECEIVED_PREFERENCE: {
             const preference = action.preference;
             this.setPreference(preference.category, preference.name, preference.value);
-            this.emitChange();
+            this.emitChange(preference.category);
             break;
         }
         case ActionTypes.RECEIVED_PREFERENCES:

webapp/utils/constants.jsx

@@ -547,7 +547,9 @@ export default {
         MESSAGE_DISPLAY: 'message_display',
         MESSAGE_DISPLAY_CLEAN: 'clean',
         MESSAGE_DISPLAY_COMPACT: 'compact',
-        MESSAGE_DISPLAY_DEFAULT: 'clean'
+        MESSAGE_DISPLAY_DEFAULT: 'clean',
+        COLLAPSE_DISPLAY: 'collapse_previews',
+        COLLAPSE_DISPLAY_DEFAULT: 'false'
     },
     TutorialSteps: {
         INTRO_SCREENS: 0,
@@ -728,10 +730,6 @@ export default {
         EMBED_PREVIEW: {
             label: 'embed_preview',
             description: 'Show preview snippet of links below message'
-        },
-        EMBED_TOGGLE: {
-            label: 'embed_toggle',
-            description: 'Show toggle for all embed previews'
         }
     },
     OVERLAY_TIME_DELAY: 400,