Jake Harr

Creates a new highlighting group (`pythonNone`) so that, in color schemes and elsewhere, `None` can be highlighted differently than other statements. There is no change in behavior, unless the user...

Address Gerrit comments

1

@zzag made some very good comments [here](https://codereview.qt-project.org/c/qt/qtimageformats/+/236077) awhile ago. They should be addressed.

Tests are sorely needed.

Right now, the default quality is arbitrarily set to 50. Since very little effort was put into that particular decision, it is probably sub-optimal. However, looking at [libheif source], that...

Use mouse forward/back button to change image

2

I find myself wanting to use these buttons out of habit, especially when thumbnail view isn't open. With the wheel, sometimes I'll accidentally skip over an image or two.