Added a fix to check if the clicked inventory is the GUI and not player's own inventory

[MCreeper12731]

Addresses issue: https://github.com/SamJakob/SpiGUI/issues/19

[SamJakob]

Hi, Thanks for your PR!
I just noticed that I use event.getInventory instead of event.getClickedInventory on lines 28 - are you able to see if removing your new check and swapping getInventory with getClickedInventory work?

[MCreeper12731]

Changed according to the instructions. There needs to be an additional check if clicked inventory is not null (occurs when the player clicks outside of the inventory UI)

[SamJakob]

All good, thanks! Did you get a chance to test this?

[MCreeper12731]

Yes, tested, and it now works only if you click in the GUI. I can send a video if you need proof

[SamJakob]

Nope that's good enough for me! Thank you :)