Strange Textarea Behaviour when adding a page

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Hi,

when adding a new page to my concrete5 websites I am not able to mark the content inside the textareas in the dialog with my mouse nor with the arrow keys (using shift).

That's not a major problem of course but since I'm interested in its solution I want to hear your opinions.

By the way the textareas behave normally after creating the site (when I'm editing the site properties in the edit dialog field). I think it's a bit strange and an unnecessary discomfort.

Is there any solution in sight?

Greets,
basti

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