Fix T84953: Incorrect tooltip for dragging collections

"Shift to parent" does not make any sense for collections since they
don't have parenting like objects. This commit just adds a simple check
for whether the first drag ID is an object before displaying
that part of the message.

Differential Revision: https://developer.blender.org/D10203

UI: Fix icon width and padding in search menus

Previously the padding size and the width saved for the icon were
constant regardless of the zoom level. This resulted in overlapping
icons and text, and ugly padding with more extreme zoom levels.
We can retrieve the size of the row from the `rect` argument.

Use RNA pointer to get node tree

Merge branch 'search-button-first-search' into temp-geometry-nodes-attribute-search

Merge branch 'search-button-allow-all' into search-button-first-search

Merge branch 'master' into search-button-allow-all

Adjust behavior for "add attribute" item

It's no longer added when there is an existing attribute with the same name

Merge branch 'master' into temp-geometry-nodes-attribute-search

Fix T85979: Attribute missing warning with empty geometry

An error doesn't make sense in these situations because we don't expect
to find attributes on empty geometry, and an empty geometry set is a
valid situation.

Note that we can't use `component.is_empty` here, because often the
component is visually "empty" but still has a point cloud with no
points or a mesh with no vertices.

Merge branch 'search-button-first-search' into temp-geometry-nodes-attribute-search