In response to user reaction to the quickbar behavior change of 1.1. @koravex implemented a new interface option (thank you) that's supposed to prevent quickbar filter changes from (accidential) left-clicks, but it's not completely working yet.
Description
As i already said here here: If the player currently holds a quickbar-linked item stack and left clicks an empty quickbar slot the filter will be moved to the empty slot.
Aka the left-click-with-stack-on-empty-quickbar-slot behavior depends on whether the cursor-stack was taken from the quickbar or an inventory.
Reproduction
1) Disable "Change quickbar by clicking with item".
2) Left click a filtered quickbar slot.
3) Left click an unfiltered quickbar slot.
Expected Behavior
When "Change quickbar by clicking with item" is disabled the filters should never be moved. The left click'ed slot could have it's filter set (like in pre-1.1) or simply stay empty (more consistent with the option name).