Scratch-blocks: Workspace scrolling is shared between sprites

[towerofnix]

Scroll/pan position should probably be stored with a value for each target, so that switching between sprites won't make you need to go back to where your far-way scripts are. (That's a huge problem I have with multiple sprites having tons of scripts in Scratch 2!)

(Probably has a bit to do with scratch-vm..)

Kind of similar to #690.

[rschamp]

Moved to LLK/scratch-gui#6

[rschamp]

Thanks @liam4 — this will be something to keep in mind as we build the GUI, which will control the communication between the blocks, renderer and VM.

[towerofnix]

Moved to LLK/scratch-gui#6

I can't wait for this to be published.. :P

[rschamp]

Soon!

[rachel-fenichel]

Tracking bug in blockly: https://github.com/google/blockly/issues/1052