UV: Document pack islands features and new ui #104468

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Chris Blackbourn wants to merge 63 commits from Chris_Blackbourn/blender-manual:uv_pack_islands into blender-v3.6-release

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@ -53,7 +53,8 @@ Shared Location
This is the default and gives the illusion that multiple faces in a UV map can share the same vertex;
in reality, they have separate vertices that overlap.
Shared Vertex
Automatically select UV vertices that correspond to the same mesh vertex, even if they have different UV coordinates.
Automatically select UV vertices that correspond to the same mesh vertex,
even if they have different UV coordinates.
This is also the behavior when *Sync Selection* is enabled.
Select Menu
@ -104,7 +105,8 @@ Select Similar :kbd:`Shift-G`
:Area 3D: Selects faces with a similar area in the 3D mesh.
:Material: Selects faces that have the same :doc:`Material </render/materials/index>`.
:Object:
Selects faces that belong to the same object. This is useful when multiple objects are in Edit mode at once.
Selects faces that belong to the same object.
This is useful when multiple objects are in Edit mode at once.
:Polygon Sides: Selects faces with a similar number of edges.
:Winding: Select faces that have the same orientation (facing upwards or downwards in the UV map).
@ -126,9 +128,10 @@ Select Split :kbd:`Y`
"Detaches" the selected faces so they can be moved elsewhere without affecting their neighbors.
.. hint::
Unlike :doc:`Split Selection </modeling/meshes/editing/mesh/split>` for meshes, which physically disconnects
faces, this is a pure selection operator. In UV space, the faces were never connected to begin with; it only seemed
that way because *Sticky Selection* automatically selected the vertices of the neighboring faces.
faces, this is a pure selection operator. In UV space, the faces were never connected to begin with;
it only seemed that way because *Sticky Selection* automatically selected the vertices of the neighboring faces.
*Select Split* deselects those vertices again.
As an alternative to *Select Split*, you can set the *Sticky Selection Mode* to *Disabled*.