MDL-81589 search: Use pix method to display global search icons

Rather than exclusively relying on the image icon in the global search
documents, the 'pix' method is used now, which allows to incorporate
FontAwesome icons whenever they're available.

search/classes/document.php

@@ -686,6 +686,8 @@ public function export_doc(\renderer_base $output): array {
         if ($docicon = $this->get_doc_icon()) {
             $data['icon'] = $output->image_url($docicon->get_name(), $docicon->get_component());
             $data['iconurl'] = $data['icon']->out(false);
+            $data['iconname'] = $docicon->get_name();
+            $data['iconcomponent'] = $docicon->get_component();
         }
         $data['textformat'] = $this->get_text_format();
 

search/templates/result.mustache

@@ -45,6 +45,10 @@
     * contextid
     * userid
     * timemodified
+    * iconname
+    * iconcomponent
+    * icon
+    * iconurl
 
     Example context (json):
     {
@@ -61,12 +65,16 @@
         [
             "file1.txt",
             "file2.txt"
-        ]
+        ],
+        "iconname": "i/customfield"
     }
 }}
 <div class="result">
     <h4 class="result-title">
-        {{#icon}}<img class="icon" alt="" src="{{{icon}}}">{{/icon}}<a href="{{{docurl}}}">{{{title}}}</a>
+        {{#iconname}}
+            {{#pix}}{{iconname}}, {{iconcomponent}}{{/pix}}
+        {{/iconname}}
+        <a href="{{{docurl}}}">{{{title}}}</a>
     </h4>
     {{#content}}
         <div class="result-content">{{{content}}}</div>