Comment 15 for bug 778540

well, the mapmaker can choose to hide immovables. he can also choose to stop hiding them, if he wants to see how they look or whether they would be in the wrong place. hiding immovables is just another tool, and it's up to the player to use it wisely. and yes, if you are changing the terrain type from meadow to mountain meadow, you want to hide the trees to see how it looks like; if you are instead changing meadow to water, then you want to see the trees and you don't use the tool.