Improper spacing in item views with custom indicator

When using a custom indicator in item views, a weird spacing issue occur :

• When element is hovered / selected, extra space is added between indicator and content.
• When element is not hovered, space between indicator and content is too small - this bug is only visible starting from 6.3.1 because in 6.3.0 the indicator is not properly stylized.

Qt 6.3.2 / 6.4.3 / 6.5.1 outputs

Here is an output from a non-minimal application that also shows issue with icons (right pane) that are set via `data()` using the decoration role