[FEATURE] Pan composer with middle mouse button
Zoom in and out on composer using mouse scroll wheel
[Feature]: anchor points for marker symbols
Implement anchor point shift and expose in simple marker dialog
Apply anchor point in svg marker symbollayer and widget
Anchor points for font marker
More data defined anchor points
Fix data defined label help
Make Anchor points usable from ellipse symbol layer too
[FEATURE] Pan composer with middle mouse button
Zoom in and out on composer using mouse scroll wheel
[Feature]: Add anchor point setting for marker symbol layers