Remove unused method from ItemListControl & try to load dashboards in HomeList only when it's empty

library/Icinga/Web/Dashboard/Common/ItemListControl.php

@@ -30,13 +30,6 @@ abstract class ItemListControl extends BaseHtmlElement
      */
     abstract protected function shouldExpandByDefault(): bool;
 
-    /**
-     * Get a class name for the collapsible control
-     *
-     * @return string
-     */
-    abstract protected function getCollapsibleControlClass(): string;
-
     /**
      * Create an action link to be added at the end of the list
      *

library/Icinga/Web/Dashboard/ItemList/DashboardHomeList.php

@@ -26,7 +26,10 @@ class DashboardHomeList extends ItemListControl
     public function __construct(DashboardHome $home)
     {
         $this->home = $home;
-        $this->home->loadDashboardEntries();
+        if (! $this->home->hasEntries()) {
+            // Just retry to load dashboards
+            $this->home->loadDashboardEntries();
+        }
 
         $this->getAttributes()
             ->registerAttributeCallback('data-icinga-home', function () {
@@ -58,11 +61,6 @@ class DashboardHomeList extends ItemListControl
         return $this->home->isActive();
     }
 
-    protected function getCollapsibleControlClass(): string
-    {
-        return 'dashboard-list-info';
-    }
-
     protected function createItemList(): BaseHtmlElement
     {
         if (! $this->headerDisabled) {

library/Icinga/Web/Dashboard/ItemList/DashboardList.php

@@ -37,12 +37,7 @@ class DashboardList extends ItemListControl
 
     protected function shouldExpandByDefault(): bool
     {
-        return $this->pane->isActive();
-    }
-
-    protected function getCollapsibleControlClass(): string
-    {
-        return 'dashlets-list-info';
+        return $this->pane->getHome()->isActive() && $this->pane->isActive();
     }
 
     protected function createItemList(): BaseHtmlElement

library/Icinga/Web/Dashboard/ItemList/DashletListItem.php

@@ -59,9 +59,9 @@ class DashletListItem extends BaseHtmlElement
     /**
      * Assemble header of this dashlet item
      *
-     * @return ValidHtml
+     * @return BaseHtmlElement
      */
-    protected function assembleHeader(): ValidHtml
+    protected function assembleHeader(): BaseHtmlElement
     {
         $header = HtmlElement::create('div', ['class' => 'dashlet-header']);
 
@@ -100,7 +100,7 @@ class DashletListItem extends BaseHtmlElement
         return $header;
     }
 
-    protected function assembleSummary()
+    protected function assembleSummary(): BaseHtmlElement
     {
         $section = HtmlElement::create('section', ['class' => 'caption']);
 

library/Icinga/Web/Dashboard/ItemList/DashletListMultiSelect.php

@@ -4,6 +4,7 @@
 
 namespace Icinga\Web\Dashboard\ItemList;
 
+use ipl\Html\BaseHtmlElement;
 use ipl\Html\Contract\FormElement;
 use ipl\Html\HtmlElement;
 
@@ -26,7 +27,7 @@ class DashletListMultiSelect extends DashletListItem
         return $this;
     }
 
-    protected function createLabel(): HtmlElement
+    protected function createLabel(): BaseHtmlElement
     {
         $label = HtmlElement::create('label');
         $label->addHtml($this->checkbox);

library/Icinga/Web/Dashboard/ItemList/EmptyDashlet.php

@@ -4,12 +4,12 @@
 
 namespace Icinga\Web\Dashboard\ItemList;
 
+use ipl\Html\BaseHtmlElement;
 use ipl\Html\HtmlElement;
-use ipl\Html\ValidHtml;
 
 class EmptyDashlet extends DashletListMultiSelect
 {
-    protected function assembleHeader(): ValidHtml
+    protected function assembleHeader(): BaseHtmlElement
     {
         $header = HtmlElement::create('div', ['class' => 'dashlet-header']);
         $header->add(t('Custom Url'));
@@ -17,7 +17,7 @@ class EmptyDashlet extends DashletListMultiSelect
         return $header;
     }
 
-    protected function assembleSummary()
+    protected function assembleSummary(): BaseHtmlElement
     {
         $section = HtmlElement::create('section', ['class' => 'caption']);
         $section->add(t('Create a dashlet with custom url and filter'));