Workaround for issue with auto-focus on Cascades TextField

Note to anyone reading. Use "inputRoute.primaryKeyTarget: true" for a robust and simple alternative to this entire mess. Do NOT use the code below. :-)

    keyListeners: [
        KeyListener {
            id: keyListener

            property bool filterFocused: filterBar.focused
            property bool filterSynced: false
            property string inferredText: ''

            onKeyReleased: {
                print('key', event.keycap, event.key, '"' + event.unicode + '"', filterBar.focused, filterBar.dynamicText);
                if (!filterBar.focused) {
                    // print('focusing');
                    filterBar.requestFocus();
                    // filterBar.text = event.unicode;
                }

                if (event.unicode) {
                    if (!filterSynced) {
                        if (event.unicode == '\b') {
                            inferredText = inferredText.slice(0, -1);
                            print('BS', '"' + inferredText + '"');
                        }
                        else
                            inferredText = inferredText + event.unicode;

                        if (inferredText != filterBar.text) {
                            filterBar.text = inferredText;
                            print('out-of-sync, force text', inferredText);
                        } else {
                            filterSynced = true;
                            print('synced!');
                        }
                    } else {
                        inferredText = filterBar.text;
                        print('tracking', inferredText);
                    }
                }

                syncTimer.start();
            }

            onFilterFocusedChanged: {
                print('filter focus?', filterFocused);
                if (!filterFocused)
                    filterSynced = false;
                else
                    syncTimer.start();
            }

            attachedObjects: [
                QTimer {
                    id: syncTimer
                    singleShot: true
                    interval: 50
                    onTimeout: {
                        if (keyListener.inferredText == filterBar.text) {
                            if (!keyListener.filterSynced)
                                print('sync detected');
                            keyListener.filterSynced = true;
                        }
                    }
                }
            ]

            function onDynamicTextChanged() {
                if (filterSynced)
                    inferredText = filterBar.text;
            }

            onCreationCompleted: {
                filterBar.dynamicTextChanged.connect(onDynamicTextChanged);
            }
        }
    ]