Error when adding a selection outside the editor while not editing

[YoranBrondsema]

When the editing mode is disabled, adding a selection outside of the editor (for example by triple clicking) throws an error.

Error: Could not find parent section for un-mapped text node "outside section"

I started a PR with a failing test: #394.

However, before I continue, @bantic maybe you can tell me what the best way to proceed would be. My thinking would be to exclude any selection outside of the editor. So when a selection includes a node after the editor, limit the selection to the last node in the editor. And if a selection includes a node from before the editor, limit the selection to the first node in the editor.

This will however, prevent from selecting anything outside of the editor. Alternatively, one could "split" the selection in two. Have the editor part handled by mobiledoc-kit and leave the other part as it is. I'm not sure how feasible that is so I'd like to have your input.

[bantic]

@YoranBrondsema Thanks for raising. I am inclined to think that when the editor is disabled, it shouldn't pay any attention to the selection — this error could be fixed by disabling the selection-detection code altogether when editing is disabled.
Do you have a use case for wanting to still have the editor react to text selection even when editing is disabled?

[YoranBrondsema]

@bantic No, not that I can think of right now. And your solution makes sense, I'll proceed with that. Thanks!