Interactive merge

[jlampel]

Merging is an extremely common task in retopology. Holding M in the Retopoflow tools could bring up an interactive merge mode that makes the process a bit faster and a bit more fun. The design needs to be fleshed out, but I imagine:

• Clicking on an edge would collapse it
• Dragging a vert towards another vert it's connected to would merge to the target vert
• Clicking the center of a face would collapse it
• The hotkey for the merge menu would be changed to when M is released if no actions were taken

Requested by Nazir on BA

[vxlcoder]

that's a great tool idea!