This gets around the bug #276 where chrome cannot handle getImageData
off a canvas on HDPI screens. In the interest of having a single
code-path, and because does not impose a large performance burden, I
think we should just use it for all platforms until chrome is really
fixed.
Also it is important to note that because this bug has to do with how
they handle accelerated 2d canvas contexts, it does not impact the stage
color picking, so that does not need to be changed.
make the swatches aligned in gui, and make sure the cursor shows when not eye dropping. Also moves eye dropper initialization into the helper. Thanks @paulkaplan!
Turns out that the width/height paper sets on the canvas is tracked at scale to the width/height we set in the `pixelRatio` value, so use that to handle grabbing pixel color rather than a constant we set.
fixes lint and gui compatibility issues shown by @paulkaplan, and also does some cleanup to references and structure as requested by @fsih. Thanks to both of you for the reviews!
FYI – part of the canvas reference change made it so that the `PaintEditor` presentation component could become a classless declaration.