Most gizmo parts have a hit space larger than the visible part. Some
parts have a hardcoded expanded hitspace, while some parts have a
(hidden) expansion of the line widths during selection. So when using
the Transform widget most pieces are easier to hit than they appear.
Except for the "cubes" at the end of the scaling arrows. This means
they are hard to hit when in orthographic views since the rotation
lines are on top of them. This PR increases the size of the cubes
during selection so they are wider than the rotation lines. This also
similarly increases the selection hit size of the arrowheads, but
mostly wider. The little squares for plane translation are also
increased but just a bit.
Pull Request: https://projects.blender.org/blender/blender/pulls/141362
acfccdcb83