GTK overlay scrollbars never appear at small window sizes, at least in Unity8.
Test case:
1. In Unity8 launch "Files".
2. Navigate to a folder with lots of files/icons.
3. Resize the window as small as it will go.
4. Slowly move the mouse so the cursor enters from the right side of the window.
Expected: Overlay scrollbars appear
Observed: Overlay scrollbars never appear (unless the window is bigger)
GTK overlay scrollbars never appear at small window sizes, at least in Unity8.
Test case:
1. In Unity8 launch "Files".
2. Navigate to a folder with lots of files/icons.
3. Resize the window as small as it will go.
4. Slowly move the mouse so the cursor enters from the right side of the window.
Expected: Overlay scrollbars appear
Observed: Overlay scrollbars never appear (unless the window is bigger)