First window is not selected by default

[OfficialKris]

Describe the bug
When starting doWM, the first window is not selected by default. I have to leave the window frame then enter the window frame to get the window selected.

To Reproduce
See above

Expected behavior
If first window even if mouse is not hovering, select window.

[cloudyster]

I can confirm the error (doWM + polybar).