Add setting to disable URL previews.

Using a temporary position in the settings screen whilst waiting for feedback.

Riot/Modules/Settings/SettingsViewController.m

@@ -120,6 +120,7 @@ enum
 {
     USER_INTERFACE_LANGUAGE_INDEX = 0,
     USER_INTERFACE_THEME_INDEX,
+    USER_INTERFACE_SHOW_URL_PREVIEWS_INDEX,
 };
 
 enum
@@ -461,6 +462,7 @@ TableViewSectionsDelegate>
     Section *sectionUserInterface = [Section sectionWithTag:SECTION_TAG_USER_INTERFACE];
     [sectionUserInterface addRowWithTag:USER_INTERFACE_LANGUAGE_INDEX];
     [sectionUserInterface addRowWithTag:USER_INTERFACE_THEME_INDEX];
+    [sectionUserInterface addRowWithTag:USER_INTERFACE_SHOW_URL_PREVIEWS_INDEX];
     sectionUserInterface.headerTitle = NSLocalizedStringFromTable(@"settings_user_interface", @"Vector", nil);
     [tmpSections addObject: sectionUserInterface];
     
@@ -2104,6 +2106,18 @@ TableViewSectionsDelegate>
             [cell vc_setAccessoryDisclosureIndicatorWithCurrentTheme];
             cell.selectionStyle = UITableViewCellSelectionStyleDefault;
         }
+        else if (row == USER_INTERFACE_SHOW_URL_PREVIEWS_INDEX)
+        {
+            MXKTableViewCellWithLabelAndSwitch *labelAndSwitchCell = [self getLabelAndSwitchCell:tableView forIndexPath:indexPath];
+            
+            labelAndSwitchCell.mxkLabel.text = NSLocalizedStringFromTable(@"settings_show_url_previews", @"Vector", nil);
+            labelAndSwitchCell.mxkSwitch.on = RiotSettings.shared.roomScreenShowsURLPreviews;
+            labelAndSwitchCell.mxkSwitch.onTintColor = ThemeService.shared.theme.tintColor;
+            
+            [labelAndSwitchCell.mxkSwitch addTarget:self action:@selector(toggleEnableURLPreviews:) forControlEvents:UIControlEventValueChanged];
+            
+            cell = labelAndSwitchCell;
+        }
     }
     else if (section == SECTION_TAG_IGNORED_USERS)
     {
@@ -3038,6 +3052,11 @@ TableViewSectionsDelegate>
     }
 }
 
+- (void)toggleEnableURLPreviews:(UISwitch *)sender
+{
+    RiotSettings.shared.roomScreenShowsURLPreviews = sender.on;
+}
+
 - (void)toggleSendCrashReport:(id)sender
 {
     BOOL enable = RiotSettings.shared.enableCrashReport;