[Interest] Button is being latched sometimes in Qt 5.6.3

[Ramakanth Kesireddy]

Hi,

Observed that button(custom QPushButton) is being latched sometimes or
stucks at the pressed state and mouseReleaseEvent event is not generated at
all.

The target platform uses Qt v5.6.3 via LinuxFB where FB_DA8XX driver
 is replaced by LCDC driver in the v4.14 linux kernel built with yocto
rocko.

Based on tests, we found that legacy fb devices are being able to be used
with Qt v5.6.3 via LinuxFB, such as the one created by the LCDC driver.

Appreciate any suggestions if such behavior is observed specific to Qt
5.6.3 or any feedback why it could occur at times?

Best Regards,
Ramakanth
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