Ecospace map edit operation my look confusing

[jeroens]

Right now, editing a map layer that displays values across a gradient may display confusing behaviour when editing. If the layer max value is erased the layer colour gradient will switch to reflect the new value range of the layer, but only cells affected by the edit operation are updated. This does not look good.

2 solutions are possible:

• Redraw the entire map when the max colour scale changes
• Freeze the layer gradient while the edit operation is in place

The latter option makes probably most sense, and is also the easiest on performance

[jeroens]

Implemented the latter option, whoohoo