Masayuki Nakano 5591cace33 Bug 1793876 - Make HTMLEditor::ComputeEditingHostInternal never return non-editable <body> r=m_kato
It returns the non-editable `<body>` causes the deletion handlers fail to
adjust range in the editing host and that caused hitting the assertion.

This patch also includes the wrong testcase with which the bug was reported.

Differential Revision: https://phabricator.services.mozilla.com/D164533
2022-12-20 07:28:24 +00:00
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