How to reproduce:
1. Create a new Unity project
2. Create a custom Game view resolution that is higher than the Game view window size (for example 4000x4000) and scale it down to smallest value
3. Change to Android platform, if you haven't added any Custom resolutions, the Free Aspect Game view should be provided, notice that its scale value is smaller than 1 (based on the resolution you chose in the previous step)
4. Move the slider, notice that now the smallest scale value is 1 as it should be

Expected result: When switching between platforms, the scale settings should be changed just as resolution/aspect ratio
Actual result: When switching between platforms, resolution/aspect ratio changes, but scale does not, resulting into the scale value being wrong. The provided steps are the only ones that consistently showed the bug, but sometimes the bug appears when entering playmode, recompiling, switching between platforms. It does not properly change the scale slider value with the resolution.

Reproducible with - 2017.2.0b2, 2017.1.0f3, 5.6.2p2, 5.5.4f1

Fixed in - 2019.2