QLineEdit is overwriting the first input character (bug?)

Hector_WPG

Hello,

I have been working with QT for and Android development.

I have a problem with QLineEdit widgets. If the textbox is empty, because of the first time or I removed the previous text, when I write then the first character becomes highlighted so if I write another character I overwrite the first character.

I have disabled several android features like "text-autocomplete", besides in QLineEdit property imhNonPredictiveText = true

Android version 9
QT 5.12.0 building for android_armv7

How to reproduce:
In a QLineEdit, remove all the characters using backspace, once it is empty, press backspace one or more times. Then write a character, it might be highlighted (selected).

Mitigation:
This is the way we are mitigating this problem, but we would like to if this is a known problem or a configuration problem, and how to solve it without using something like this:


// QLineEdit bug fix
connect(ui->qlineeditWidget, SIGNAL(cursorPositionChanged(int,int)), this, SLOT(resetQLineEditSelectionIssue(int,int)));


void FrmWifiSettings::resetQLineEditSelectionIssue(int oldPos, int newPos)
{
	QObject * senderObj = sender();

	if (senderObj != nullptr)
	{
		QLineEdit *widget = (QLineEdit*) senderObj;

		if ( (widget != nullptr) && (oldPos == 0) && (newPos == 1) && (widget->hasSelectedText()) )
		{
			qDebug() << "resetQLineEditSelectionIssue() : issue found ";
			widget->deselect();
		}
	}
}

Thanks

jsulm

@Hector_WPG You should check Qt bug tracker. If it is not known issue there you can file a bug.

aha_1980

@jsulm That is correct, but I'd first try with the latest Qt 5 version 5.15.2

Regards