qgis/Quantum-GIS — pull request #876 by nyalldawson (2013-09-05 11:23:47+00:00)
Title: [FEATURE] Pan composer with middle mouse button

... and allow zoom in and out on composer using mouse scroll wheel. Map item zooming now only applies if the move item content tool is used and the map is selected, to prevent accidental change of scale when mouse wheel is used.