I did also try the idea of using an "active" marker in a separate
table column to indicate the active layer and that worked alright,
but much less obvious and visible than using the selection highlight
for this. It also added another column to the table which I'd prefer
to keep to a minimum width so that the user has the largest
available working space in the window. (The layers table and the
content are side-by-side in a split view).
I've decided to go back to this approach, which avoids the problem
altogether. I realised that using the highlight of the table to
represent some state in my model is probably not such a great idea -
it creates further problems like not being able to drag-reorder group
items or pick up several items at once and dragging them into a group.
The extra space needed is a slight downside but i can live with it...
I suspect you were simply waiting for me to realise this ;-)
cheers, Graham
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