mapeditor: mwheel-zoom to cursor is nonfunctional

[jengelh]

SLADE Version: 3.2.0_b1-14-gf4abef2f Operating System: linux

Issue Details: The position of the mouse cursor no longer influences the zoom position at all. Reproducible by picking the top left corner of the map editor and mwheeling it in. Instead, of gradually going towards that corner, the mapcenter stays hovered over one coordinate. Regression from 3.1.12 to 3.2.0b1.

[sirjuddington]

Hmm, this isn't happening for me, in fact it's kind of the opposite - using the keybinds for 'zoom in to center' aren't working correctly and instead zoom towards the mouse cursor :P