[GAMEPLAY] [9.20] "browser forward" (mouse button 5) minimizes League the first time you press it.
How to reproduce:
Step 1) Start any game of summoner's rift (I don't think this behavior happens on all maps) Step 2) Press mouse button 5 (which is specifically bound to "quick alert ping" for me) during the loading screen OR when the game starts Step 3) The game will minimize for no reason Step 4) Click the League icon on the start menu to bring it back up. It won't happen again until the next game
Other important info: Windows 10, full screen enabled, and this will still happen even if you make sure the window has focus by clicking on it a couple times with mouse button 1.
Other mouse buttons may trigger this. I normally spam all my mouse buttons during the loading screen to trigger the bug so it won't happen while I'm in game. But "button 5" seems to be consistently doing it for me.
EDIT: mouse button 4 (bound to "stop" for me) also does it consistently.