Blender Git Loki

Fix T89829: wrong active context path check in spreadsheet

The problem was that the modifier was reevaluated all the time, even
between showing the attribute search and clicking on the attribute
name. This freed the data referenced by attribute search. The real bug
here was that the dependency graph was tagged for update even
though nothing changed. This was because the spreadsheet thought
its active context has changed and it wanted to compute the new
value to be shown in the spreadsheet.

The reason for the bug was that I confused how the tree-path of a
node editor works. The second element in the tree path contains
the name of the group node in the root tree that we're in (instead
of the first element).

Differential Revision: https://developer.blender.org/D12009