Support expanding/collapsing Web UI folders with arrow keys

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

@@ -2066,6 +2066,19 @@ window.qBittorrent.DynamicTable = (function() {
                 row.full_data.remaining = 0;
             else
                 row.full_data.remaining = (row.full_data.size * (1.0 - (row.full_data.progress / 100)));
+        },
+
+        setupTr: function(tr) {
+            tr.addEvent('keydown', function(event) {
+                switch (event.key) {
+                    case "left":
+                        qBittorrent.PropFiles.collapseFolder(this._this.getSelectedRowId());
+                        return false;
+                    case "right":
+                        qBittorrent.PropFiles.expandFolder(this._this.getSelectedRowId());
+                        return false;
+                }
+            });
         }
     });
 

src/webui/www/private/scripts/prop-files.js

@@ -43,7 +43,9 @@ window.qBittorrent.PropFiles = (function() {
             createPriorityCombo: createPriorityCombo,
             updatePriorityCombo: updatePriorityCombo,
             updateData: updateData,
-            collapseIconClicked: collapseIconClicked
+            collapseIconClicked: collapseIconClicked,
+            expandFolder: expandFolder,
+            collapseFolder: collapseFolder
         };
     };
 
@@ -495,6 +497,20 @@ window.qBittorrent.PropFiles = (function() {
             collapseNode(node);
     };
 
+    const expandFolder = function(id) {
+        const node = torrentFilesTable.getNode(id);
+        if (node.isFolder) {
+            expandNode(node);
+        }
+    };
+
+    const collapseFolder = function(id) {
+        const node = torrentFilesTable.getNode(id);
+        if (node.isFolder) {
+            collapseNode(node);
+        }
+    };
+
     const filesPriorityMenuClicked = function(priority) {
         const selectedRows = torrentFilesTable.selectedRowsIds();
         if (selectedRows.length === 0) return;