Solves a problem that prevents qt message icons from being displayed
Description
QMsgBox is a class that inherits QMessageBox to replace the static
functions:
* QMessageBox::warning
* QMessageBox::information
* QMessageBox::critical
* QMessageBox::question
All other functions remain the same. The usage of the replaced
function also remains the same.
The objective of this class is to solve a problem that prevents the
message icon from being displayed in some platforms with some Qt
styles.
