Toolbar: ask for confirmation when "Home" is clicked

So far confirmation was only asked for when clicking one of the data
view entries directly. It is more consistent and safe to also ask for
confirmation when "Home" is clicked directly, too.

CHANGELOG.md

@@ -173,6 +173,9 @@ Miscellaneous:
 - The navigate-with-project setting of a stack viewer is now respected in
   stored layouts.
 
+- Clicking the Home link in the upper left corner with a project open, will now
+  also ask for confirmation (like clicking any data view entry in the menu).
+
 ## Maintenance updates
 
 - Node distance measurements: computation of straight line distance has been

django/applications/catmaid/static/js/init.js

@@ -577,6 +577,12 @@ var project;
     document.getElementById( "account" ).onkeydown = login_oninputreturn;
     document.getElementById( "password" ).onkeydown = login_oninputreturn;
 
+    document.getElementById( "home_button" ).addEventListener('click', event => {
+      CATMAID.client.confirmLoadHomeView()
+        .catch(CATMAID.handleError);
+      return false;
+    });
+
     CATMAID.DataViews.list().then(dataviews => {
       this._knownDataViews = dataviews;
       this._updateDataViewMenu();
@@ -1818,7 +1824,7 @@ var project;
     // If a project is active, ask for confirmation before closing it.
     if (project) {
         if (!confirm('Are you sure you want to close all widgets and views?')) {
-          return;
+          return Promise.reject(new CATMAID.Warning('Cancelled by user'));
         }
       project.destroy();
     } else {
@@ -1887,6 +1893,21 @@ var project;
     }
   };
 
+  /**
+   * Ask the user whether to close an active project, before loading the home
+   * view.
+   */
+  Client.prototype.confirmLoadHomeView = function(backgroundDataView = false) {
+    // If a project is active, ask for confirmation before closing it.
+    if (project) {
+      if (!confirm('Are you sure you want to close the active project including all windows?')) {
+        return Promise.reject(new CATMAID.Warning('Cancelled by user'));
+      }
+      project.destroy();
+    }
+    return CATMAID.client.loadHomeView(backgroundDataView);
+  };
+
   /**
    * Load a particular data view.
    *
@@ -1925,7 +1946,7 @@ var project;
    */
   Client.prototype.load_default_dataview = function(background) {
     var self = this;
-    CATMAID.DataViews.getDefaultConfig()
+    return CATMAID.DataViews.getDefaultConfig()
       .then(function(config) {
         // If no data view is defined on the back-end, use a default data view.
         if (!config || !config.id || CATMAID.tools.isEmpty(config.config)) {

django/applications/catmaid/templates/catmaid/index.html

@@ -78,7 +78,7 @@
         <div class="menu toolbar_item">
           <div id="home_box" class="box">
             <div class="menu_item" style="float:left" onpointerover="this.lastChild.style.display = 'block';" onpointerout="this.lastChild.style.display = 'none';">
-              <p><a onclick="if (project) { project.destroy(); } else { CATMAID.client.loadHomeView(); } return false;">Home</a></p>
+              <p><a id="home_button">Home</a></p>
               <div class="pulldown" id="dataview_menu"></div></div>
           </div>
           <div id="projectmenu_box" class="box">