Editing a template: List template parts consumed, and provide access to edit them in isolation

[jameskoster]

While editing a template it could be handy to have quick access to a list of consumed template parts, along with links to edit them in a focussed view.

Some areas we might consider exposing this list and/or access to a focussed edit view:

• Template information popover in top bar
• "Template" tab in the Inspector
• The ellipsis menu in the toolbar when a template part is selected
• The Preview/View menu in the top bar

[jameskoster]

Here's a concept that explores the ideas outlined in the OP:

areas.mp4

I think that listing the template parts in the "Template" tab of the Inspector, and the template details popover work well. The "View" menu... not so much.

Using this UI to select the template part aligns nicely with the parent block selection flow:

Isolated edit mode can be accessed through the ellipsis menu on the block tool bar, once the template part has been selected. That will be explored in more detail in #29148.

[noisysocks]

Is it possible too have nested template parts? If so, should we display a list of consumed template parts in the isolated template part editor's dropdown as well?

[mtias]

It's possible but we should not do anything extra to accommodate it — the user would be able to select the nested part and focus on it if necessary, like using the list view panel for example.

[kevin940726]

All of the above except for the Preview/View menu have been implemented. Have we decided to implement it in Preview/View yet? It seems a little bit weird to me to have template areas in that menu. Just doesn't feel like it belongs there.

[jameskoster]

Nice work! We can leave the View menu for now.