Book outline confirm form uses wrong arguments

I see the bug also, and this patch fixes it. However, warning text like that used in function book_form_node_delete_confirm_alter() should be added as well if the page has children.

I was thinking something more like this in terms of varying the description depending on whether the node has children.

Looks fine, applies cleanly, and works. Much more informative than before.

I would not say "This may make it difficult to re-create the existing hierarchy." is anywhere close to informative. This suggests an uncertain outcome of the action, which is not something one can decide to agree or not. Can we be more specific, ie. not uncertain?

how about something like:

'%title has associated child pages, which will be relocated automatically to maintain their connection to the book.  In order to re-create the existing hierarchy, %title may be added again using the Outline tab, and each of its former child pages relocated manually.'

It's wordy, but perhaps more accurate.

It is more accurate, but I needed to stop on the "in order to" part and reread multiple times to get it. I think you mean:

'%title has associated child pages, which will be relocated automatically to maintain their connection to the book. If you'd like to recreate the hierarchy used before, %title may be added again using the Outline tab, and each of its former child pages relocated manually.'

The "existing" word without (to me) proper time information mislead me actually. I am not a native English speaker, so the above might not be correct. Feel free to fix or come up with better ideas.

'%title has associated child pages, which will be relocated automatically to maintain their connection to the book. To recreate the hierarchy (as it was before removing this page), %title may be added again using the Outline tab, and each of its former child pages relocated manually.'

that maybe?

Yes, this sounds much better.

patch with that wording attached.

patch applies - looks fine and works.

Thanks, committed!