https://bugs.winehq.org/show_bug.cgi?id=47929
--- Comment #8 from Jim kilzzz@hotmail.com --- (In reply to minion from comment #7)
For anyone having this issue and doesn't already know about this. There is a reg hack workaround. Open up the wine console to open regedit and add the following key.
[HKCU\software\Wine\X11 Driver] > New String > UseTakeFocus="no"
TYVM I was unaware of the setting. After enabling the reg-edit Hearthstone is back to how it performed before the update. A tip for others is that it can be enabled through winetricks in the "change a setting" menu.