Add ability to use 'shift+delete' to delete torrents in WebUI

Closes #13827.

src/webui/www/private/confirmdeletion.html

@@ -11,6 +11,9 @@
         'use strict';
 
         window.addEvent('domready', function() {
+            const isDeletingFiles = (new URI().getData('deleteFiles') === "true");
+            $('deleteFromDiskCB').checked = isDeletingFiles;
+
             const hashes = new URI().getData('hashes').split('|');
             $('cancelBtn').focus();
             $('cancelBtn').addEvent('click', function(e) {

src/webui/www/private/scripts/client.js

@@ -1225,6 +1225,10 @@ new Keyboard({
         'delete': function(event) {
             deleteFN();
             event.preventDefault();
+        },
+        'shift+delete': (event) => {
+            deleteFN(true);
+            event.preventDefault();
         }
     }
 }).activate();

src/webui/www/private/scripts/mocha-init.js

@@ -376,14 +376,14 @@ const initializeWindows = function() {
         }
     };
 
-    deleteFN = function() {
+    deleteFN = function(deleteFiles = false) {
         const hashes = torrentsTable.selectedRowsIds();
         if (hashes.length) {
             new MochaUI.Window({
                 id: 'confirmDeletionPage',
                 title: "QBT_TR(Deletion confirmation)QBT_TR[CONTEXT=confirmDeletionDlg]",
                 loadMethod: 'iframe',
-                contentURL: 'confirmdeletion.html?hashes=' + hashes.join("|"),
+                contentURL: ('confirmdeletion.html?hashes=' + hashes.join("|") + '&deleteFiles=' + deleteFiles),
                 scrollbars: false,
                 resizable: false,
                 maximizable: false,