ENGCOM-1779: [Backport] Fixed set template syntax issue #15657

Author: Stanislav Idolov

app/code/Magento/Backend/Block/Dashboard.php

@@ -18,7 +18,7 @@ class Dashboard extends \Magento\Backend\Block\Template
     /**
      * @var string
      */
-    protected $_template = 'dashboard/index.phtml';
+    protected $_template = 'Magento_Backend::dashboard/index.phtml';
 
     /**
      * @return void

app/code/Magento/Backend/Block/Dashboard/Graph.php

@@ -90,7 +90,7 @@ class Graph extends \Magento\Backend\Block\Dashboard\AbstractDashboard
     /**
      * @var string
      */
-    protected $_template = 'dashboard/graph.phtml';
+    protected $_template = 'Magento_Backend::dashboard/graph.phtml';
 
     /**
      * Adminhtml dashboard data

app/code/Magento/Backend/Block/Dashboard/Grid.php

@@ -15,7 +15,7 @@ class Grid extends \Magento\Backend\Block\Widget\Grid\Extended
     /**
      * @var string
      */
-    protected $_template = 'dashboard/grid.phtml';
+    protected $_template = 'Magento_Backend::dashboard/grid.phtml';
 
     /**
      * Setting default for every grid on dashboard

app/code/Magento/Backend/Block/Dashboard/Sales.php

@@ -16,7 +16,7 @@ class Sales extends \Magento\Backend\Block\Dashboard\Bar
     /**
      * @var string
      */
-    protected $_template = 'dashboard/salebar.phtml';
+    protected $_template = 'Magento_Backend::dashboard/salebar.phtml';
 
     /**
      * @var \Magento\Framework\Module\Manager

app/code/Magento/Backend/Block/Dashboard/Totals.php

@@ -17,7 +17,7 @@ class Totals extends \Magento\Backend\Block\Dashboard\Bar
     /**
      * @var string
      */
-    protected $_template = 'dashboard/totalbar.phtml';
+    protected $_template = 'Magento_Backend::dashboard/totalbar.phtml';
 
     /**
      * @var \Magento\Framework\Module\Manager

app/code/Magento/Backend/Block/Page/Copyright.php

@@ -15,5 +15,5 @@ class Copyright extends \Magento\Backend\Block\Template
      *
      * @var string
      */
-    protected $_template = 'page/copyright.phtml';
+    protected $_template = 'Magento_Backend::page/copyright.phtml';
 }

app/code/Magento/Backend/Block/Page/Footer.php

@@ -15,7 +15,7 @@ class Footer extends \Magento\Backend\Block\Template
     /**
      * @var string
      */
-    protected $_template = 'page/footer.phtml';
+    protected $_template = 'Magento_Backend::page/footer.phtml';
 
     /**
      * @var \Magento\Framework\App\ProductMetadataInterface

app/code/Magento/Backend/Block/Page/Header.php

@@ -18,7 +18,7 @@ class Header extends \Magento\Backend\Block\Template
     /**
      * @var string
      */
-    protected $_template = 'page/header.phtml';
+    protected $_template = 'Magento_Backend::page/header.phtml';
 
     /**
      * Backend data

app/code/Magento/Backend/Block/Store/Switcher/Form/Renderer/Fieldset.php

@@ -23,7 +23,7 @@ class Fieldset extends \Magento\Backend\Block\Template implements \Magento\Frame
     /**
      * @var string
      */
-    protected $_template = 'store/switcher/form/renderer/fieldset.phtml';
+    protected $_template = 'Magento_Backend::store/switcher/form/renderer/fieldset.phtml';
 
     /**
      * Retrieve an element

app/code/Magento/Backend/Block/Store/Switcher/Form/Renderer/Fieldset/Element.php

@@ -21,7 +21,7 @@ class Element extends \Magento\Backend\Block\Widget\Form\Renderer\Fieldset\Eleme
     /**
      * @var string
      */
-    protected $_template = 'store/switcher/form/renderer/fieldset/element.phtml';
+    protected $_template = 'Magento_Backend::store/switcher/form/renderer/fieldset/element.phtml';
 
     /**
      * Retrieve an element