QML: why multi lines 'PlatformInputContext::update()' displayed in debug output
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I'm updating one HMI embeded system using QML based on QT5.9 with virtualkeyboard plugin. Now every time main() start, the debug console will output multi lines indicate inputcontext update. and when i do some operate on the screen. it also displayed many tips about "PlatformInputContext::update()". who can tell me is something wrong and how to avoid it: the output message show:
// main.qml message output
======> desktop is already started stdin: is not a tty File logger created. thread ID : 0x75b64000 QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root' getInstance new a Mayconfig getInstance end configs=0x12964f0 wifi is detected hotplug thread new netlink status change getInstance getInstance end my tcpserver start **setInputContext,step 001: 14c3fc8 InputEngine::InputEngine, Step001, inputContext:0x14c3fc8 InputEngine::InputEngine, Step002 InputEngine::InputEngine, Step003** ResetCounter() Serial3 initilized serial1 initialized ------------------------------------- qml: main.qml completed QIODevice::write (QSerialPort): device not open QIODevice::write (QSerialPort): device not open qml: checkFWtimer.start() qml: Usbprint.qml completed qml: initDatabase_set() **qml: scale in remotecontrol 1.25 1.33 InputContext::setLocale(): "en_GB" PlatformInputContext::setLocale(): QLocale(English, Latin, UnitedKingdom) InputEngine::update, step 002 InputContext, step2, emit localeChange() "en_GB" InputContext::setLocale(): "en_GB" InputContext::setLocale(): "en_GB"** qml: fwVersion when checkFWtimer.stop(): PRO610 QIODevice::write (QSerialPort): device not open qml: U0 QIODevice::write (QSerialPort): device not open qml: U4 QIODevice::write (QSerialPort): device not open qml: U13 QIODevice::write (QSerialPort): device not open qml: M582