Can't set selection on QLabel after changing its text

[AlaaM]

Every time I use .setText() on a QLabel it loses the previous selection. And then if I re-set the selection, it doesn't show any selection.

Here's my code:

• First, initialize QLabel with text, in class constructor:

label->setText("");
for(int i=0; i<ABC; i++){
   label->setText(label->text() + ('a' + i));
}

• Now set selection:

highlightNextChar(label);

void MyClass::highlightNextChar(QLabel* label)
{
    int selectionEnd = label->selectionStart();
    if(selectionEnd == label->text().length()-1){
        return;
    }
    label->setSelection(selectionEnd+1,1);
}

I do this as I click the RIGHT_BUTTON on the keyboard, highlighting the next char on every hit.
All of this works.
At some point I change the text on the label:

label->setText(label->text() + label->text().mid(0,1)); //add char
label->setText(label->text().mid(1)); //shift left

At this point, the selection disappears. I set focus on the label and then try to set selection:

label->setFocus();
label->setSelection(INDEX , 1);

The focus is set but setSelection() isn't working. It simply does nothing.
I also tried executing the last 2 commands after a 3-second timer finishes. Also then setSelection does nothing.

Any help?

[AlaaM]

I solved it.
Before setting selection, do clearFocus() and only then setFocus().
So, change these 2 lines:

label->setFocus();
label->setSelection(INDEX , 1);

to:

label->clearFocus();
label->setFocus();
label->setSelection(INDEX , 1);

That's very weird.