As per the documentation: A message box displays a primary
text to alert the user to a situation, an informative text to
further explain the situation, and an optional detailed text to provide
even more data if the user requests it.
The AppKit NSAlert doesn't provide such a "detailed" section, and our
code just added this "even more data" detailed text to the primary text.
This breaks the UI when the detailed text is very long, perhaps a
complete log output with dozens or even hundreds of lines of text.
Since NSAlert doesn't provide a "details" space, fall-back to the non-
native message box if detailed text is provided.
[ChangeLog][QtWidgets][QMessageBox] On Apple platforms, the native
message box is no longer used when detailed text is set.
Pick-to: 6.6 6.5
Fixes: QTBUG-118992
Change-Id: I6f4764ceb8f8e57d641c0b0660223a9c26f5bd26
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
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