fillRectList has this amazing behaviour, the ability to join adjacent blocks together (without using paths!), which also works when the whole context is scaled.
This is what it looks like when using a context scaling of 1.25
The non-scaled coordinates, are on integer values next to each other.
On the top, 3 rectangles drawn separately via fillRect
On the bottom, 3 rectangles drown via fillRectList
On Windows with the Software Renderer
Build with XCode 9.4 and JUCE 4 with CoreGraphics
And then, this is how it looks like with latest Xcode and Juce 6 and CoreGraphics
The problem, the blocks are not merged together, as you see.
What could cause the problem?
It looks like the CoreGraphics code hasn’t substantially changed?!