It's been raining, but what would you expect in Hamburg at his time of the year. Not that it's really better in other seasons, although it tends to rain a bit less often in the summer.
This is the right weather to sit indoors with a nice cup of tea and look out of the window and watch the people hasten by hunched up under their umbrellas. ;-)
Finally started work on more detailed change messages in Sketch's document and object classes. The goal is to make updating views like the tree view more efficient by letting them know which object's actually changed and therefore which branches of their tree structure have to be updated.
To test this I also began to implement the tree view in earnest. It seems to work quite well so far, but it's not finished yet.