Left/right arrows to scroll tab bar not working in Mac build
This is a puzzler and no mistake.
The left/right arrow buttons next to the layer property box tabs aren't working in our Mac build.
This build uses Qt 5.11.2 with the macOS 10.13 SDK (Xcode 9).
They do work in a new build using Qt 5.12 beta with the macOS 10.14 SDK (Xcode 10).
They also appear to work in a build using Qt 5.11.2 with macOS 10.14 SDK (Xcode 10).
So it looks as if the common problem is the platform SDK version. But I don't want to switch to the newer SDK until Qt officially supports it, which won't be until Qt 5.12 goes out of beta. This might happen in as little as a month, but I also don't really want to switch & then release without more testing in between.