Make `HTMLEditUtils::IsEmptyNode` refer computed style
Categories
(Core :: DOM: Editor, defect, P2)
Tracking
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| Tracking | Status | |
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| firefox121 | --- | fixed |
People
(Reporter: masayuki, Assigned: masayuki)
References
Details
Attachments
(1 file)
HTMLEditUtils::IsEmptyNode checks the visibility of given node without too strict checks. Now, the callers can set the options to TreatListItemAsVisible and TreatTableCellAsVisible, but the method does not check the actual style of found elements. Therefore, e.g., HTMLEditUtils::IsEmptyInlineContainer may get odd result because it's defined as:
return HTMLEditUtils::IsInlineContent(aContent, aBlockInlineCheck) &&
HTMLEditUtils::IsContainerNode(aContent) &&
HTMLEditUtils::IsEmptyNode(aContent, aOptions);
but only the first line refers the style.
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Assignee | |
Comment 1•11 months ago
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Gecko starts referring computed style to consider whether block or inline and
HTMLEditUtils::IsEmptyNode is used with them to check a node like these:
https://searchfox.org/mozilla-central/rev/40d51bef58b8e901d6ab4b60dd280f372a0e417d/editor/libeditor/HTMLEditUtils.h#543,554
However, IsEmptyNode still checks only the tag names when the caller wants
to treat "list items" and/or "table cells" are visible (not empty). Therefore,
this mismatch may cause the assertion failure reported in the bug.
From code design point of view, HTMLEditUtils::IsListItem and
HTMLEditUtils::IsTableCell should refer the computed style. However, the
former is mostly used for checking the logical structure of HTML, and in the
latter case, we should keep the table structure even if table cells are styled
as inline because browsers do not support table structure recreation except
the Gecko specific editing UI (called inline table editor). Therefore, it does
not make sense that we would change them.
Instead, we should change IsEmptyNode which is used only for visibility check.
So, using computed style is always reasonable.
Note that this patch changes the behavior in some edge cases. The method always
treat a list item or a table cell which contains a sub-list or a sub table.
However, I would not like to add new EmptyCheckOption for it to check the
complicated style check. Therefore, this patch changes the behavior to treat
them visible if and only if they have another list item or another table cell.
Basically, <table> and list elements should have a least one table cell or
one list item. Therefore, this change should not appear in the web apps in the
wild.
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Comment 4•11 months ago
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| bugherder | ||
Description
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