Workspace scrolling is shared between sprites

[rschamp]

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 scratchfoundation/scratch-blocks#690.

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Moved from scratchfoundation/scratch-blocks#693
/cc @liam4

[tmickel]

Not sure if it's possible to get/set the workspace pan position from scratch-blocks currently, so that might need to be added over there. It might make sense though that this should be the responsibility of scratch-gui (no reason for the VM to know where the workspace is located). And hopefully wherever you store this value could also be the place where we store the undo/redo stack for each sprite.

[rachel-fenichel]

Tracking bug in blockly: google/blockly#1052

[paulkaplan]

Per-sprite workspace positioning has been implemented.