included CE not deleteable -> without hint

[Metis77]

If a CE is included somewhere else, it can not be deleted. The red delete cross is greyed out.

I suggest to add a hint, that this is included somewhere else, and can therefor not be deleted.

Otherwise people, like me, might search for an error solution ...

[fritzmg]

Also, if you simply do not remember where you included that CE, it might take you some time until you find the include element.

[discordier]

So what do you suggest? A hint will be a static text. Furthermore we can only tell you which references the CE, but a full lookup is costly and will most likely be confusing when displayed.

[fritzmg]

I tried something like that with https://github.com/fritzmg/contao-be-include-info But yeah, it can be confusing, but can also be helpful.

[Metis77]

Sure, details would be helpful. But may only after clicking an hint. Than detailed info could be shown in a modal. And with a modal the lookup could be done only if anybody clicks.

[leofeyer]

Almost a duplicate of #2953.

[Mynyx]

How about adding as first step a tooltip there, that deleting is unavailable because of an include anywhere.