Don't render tools control when getRenderingMode is set to post-only

[richtabor]

The write and design tools selection UI is relevant when editing content like blog posts. The tools are most helpful in the context of templates. I propose the control is not rendered if getRenderingMode() is set to post-only.

In trunk, this condition can be set via the Inspector's Template control, by choosing to change the template display with the "Show template" option (in both the post editor and site editor).

Tools UI

Showing and hiding a template with getRenderingMode

Ideally the UX for showing and hiding a template should be clearer (not buried in the Inspector). I'll open another issue to push that forward.

[draganescu]

Should we instead of hiding the control, switch out of post only if design is selected? Isn't that more fluid than disappearing UI elements?

It does conflict a bit with the saved pref thing - going the route I suggest above would mean that once you set design mode then all posts will be in template mode until you switch back to write mode. But I still think this is an easier thing to handle than hiding the control based on a settong in a list of settings in a tab in the inspector.

[richtabor]

Closing in favor of #66775 (its more detailed/more current).

[richtabor]

It does conflict a bit with the saved pref thing

Yea, that's my hesitation there. I'm also aware of users accidentally triggering "Write" mode when the template is not previewed, resulting in a challenging experience.