564688 - nsITransferable::GetTransferData returns error for text/unicode flavor that exists but is empty

Status: RESOLVED DUPLICATE of bug 1493292

(Core :: DOM: Serializers, defect)

Description

[Mats Palmgren (inactive)]

Attachment: mochitest.diff

nsITransferable::GetTransferData returns error for text/unicode flavor that exists but is empty.

Fwiw, I discovered this while writing tests for bug 39098.
It doesn't seem like the appropriate behavior.

STEPS TO REPRODUCE
1. apply the attached patch (contains test_NNNN.html mochitest)
2. make content/base/test/
3. run mochitest --test=content/base/test/test_NNNN.html

ACTUAL RESULTS
An exception.

EXPECTED RESULTS
Since clipboard.hasDataMatchingFlavors(["text/unicode"]...) is true
it seems it should be possible to retrieve the data for that flavor
through a "text/unicode" nsITransferable without getting exceptions.
The result should be an empty string object or null?

Comment 1

[Tom S [:evilpie]]

Bug 1493292 is going to fix this, because we won't care about the length anymore when returning data.