Feature Request: add a 'search' box like the one for the model tree

Even with a nice and clean subtree, a 'search' box in the Script Manager would be a quick way to filter (whatever the subfolder) scripts whose names contain 'Import' (I have 6 different scripts import-related, depending on some context) or 'Coordinates' ('Get Coordinates' and 'Set Coordinates').

For example, a mockup:


Start by locating the Script Manager UI and the existing search box used for the model tree. Trace how scripts are displayed across subfolders, then determine how the requested box should filter names such as “Import” and “Coordinates”; done means matching scripts are findable regardless of their subfolder.

Written by the indexing model from the issue text.