[auth] ctrl+f to activate search box for icons

auth/lib/ui/custom_icon_page.dart

@@ -4,6 +4,7 @@ import 'package:ente_auth/services/preference_service.dart';
 import 'package:ente_auth/theme/ente_theme.dart';
 import 'package:ente_auth/ui/utils/icon_utils.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 
 class CustomIconPage extends StatefulWidget {
   final Map<String, AllIconData> allIcons;
@@ -29,12 +30,14 @@ class _CustomIconPageState extends State<CustomIconPage> {
 
   // Used to request focus on the search box when clicked the search icon
   late FocusNode searchBoxFocusNode;
+  final Set<LogicalKeyboardKey> _pressedKeys = <LogicalKeyboardKey>{};
 
   @override
   void initState() {
     _filteredIcons = widget.allIcons;
     _showSearchBox = _autoFocusSearch;
     searchBoxFocusNode = FocusNode();
+    ServicesBinding.instance.keyboard.addHandler(_handleKeyEvent);
     super.initState();
   }
 
@@ -42,9 +45,41 @@ class _CustomIconPageState extends State<CustomIconPage> {
   void dispose() {
     _textController.dispose();
     searchBoxFocusNode.dispose();
+    ServicesBinding.instance.keyboard.removeHandler(_handleKeyEvent);
     super.dispose();
   }
 
+  bool _handleKeyEvent(KeyEvent event) {
+    if (event is KeyDownEvent) {
+      setState(() {
+        _pressedKeys.add(event.logicalKey);
+        if ((_pressedKeys.contains(LogicalKeyboardKey.controlLeft) ||
+                _pressedKeys.contains(LogicalKeyboardKey.control) ||
+                _pressedKeys.contains(LogicalKeyboardKey.controlRight)) &&
+            event.logicalKey == LogicalKeyboardKey.keyF) {
+          _showSearchBox = true;
+          searchBoxFocusNode.requestFocus();
+          _textController.clear();
+          _searchText = "";
+          return;
+        }
+        if (event.logicalKey == LogicalKeyboardKey.escape) {
+          setState(() {
+            _textController.clear();
+            _searchText = "";
+            _showSearchBox = false;
+            _applyFilteringAndRefresh();
+          });
+        } else if (event is KeyUpEvent) {
+          setState(() {
+            _pressedKeys.remove(event.logicalKey);
+          });
+        }
+      });
+    }
+    return false;
+  }
+
   void _applyFilteringAndRefresh() {
     if (_searchText.isEmpty) {
       setState(() {