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Bug 1989861 - Make HTMLEditor::EnsureNoFollowingUnnecessaryLineBreak consider a preceding <br> of a mailcite is necessary a=dmeehan

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The serializer needs to make each mailcite starts from head of a line.
However, mailcite may be a blocked `<span>`.  So, its preceding `<br>`
is not required from the HTML point of view, but we need to preserve
it for the serializer.

If we need this hack in some other places, we should make
`HTMLEditUtils::GetFollowingUnnecessaryLineBreak()` aware of this
special handling in a follow up bug.

Differential Revision: https://phabricator.services.mozilla.com/D270784
This commit is contained in:
Masayuki Nakano
2025-10-31 12:49:41 +00:00
committed by dmeehan@mozilla.com
parent 8e53bd4fcd
commit 3d600c8b5d
3 changed files with 92 additions and 0 deletions
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16
editor/libeditor/HTMLEditor.cpp
View File

@@ -4699,6 +4699,22 @@ nsresult HTMLEditor::EnsureNoFollowingUnnecessaryLineBreak(
return NS_OK;
}
if (unnecessaryLineBreak->IsHTMLBRElement()) {
// If the found unnecessary <br> is a preceding one of a mailcite which is a
// <span> styled as block, we need to preserve the <br> element for the
// serializer to cause a line break before the mailcite.
if (IsPlaintextMailComposer()) {
const WSScanResult nextThing =
WSRunScanner::ScanInclusiveNextVisibleNodeOrBlockBoundary(
WSRunScanner::Scan::All,
unnecessaryLineBreak->After<EditorRawDOMPoint>(),
BlockInlineCheck::UseComputedDisplayOutsideStyle);
if (nextThing.ReachedOtherBlockElement() &&
HTMLEditUtils::IsMailCite(*nextThing.ElementPtr()) &&
HTMLEditUtils::IsInlineContent(
*nextThing.ElementPtr(), BlockInlineCheck::UseHTMLDefaultStyle)) {
return NS_OK;
}
}
// If the invisible break is a placeholder of ancestor inline elements, we
// should not delete it to allow users to insert text with the format
// specified by them.

3
editor/libeditor/tests/mochitest.toml
View File

@@ -479,6 +479,9 @@ skip-if = ["display == 'wayland'"] # Bug 1935188
["test_mailcite_backspace_at_end_of_inline_reply.html"]
skip-if = ["xorigin"] # Testing internal API for comm-central
["test_mailcite_keep_preceding_br_after_insert.html"]
skip-if = ["xorigin"] # Testing internal API for comm-central
["test_mailcite_keep_trailing_br_after_delete.html"]
skip-if = ["xorigin"] # Testing internal API for comm-central

73
editor/libeditor/tests/test_mailcite_keep_preceding_br_after_insert.html Normal file
View File

@@ -0,0 +1,73 @@
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Preceding &lt;br&gt; of a mailcite which is a blocked &lt;span&gt;</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<script>
"use strict";
SimpleTest.waitForExplicitFinish();
SimpleTest.waitForFocus(async () => {
const iframe = document.querySelector("iframe");
await new Promise(resolve => {
if (iframe.contentDocument?.readyState == "complete") {
resolve();
return;
}
iframe.addEventListener("load", resolve, {once: true});
});
const win = iframe.contentWindow;
getEditor(win).flags |=
SpecialPowers.Ci.nsIEditor.eEditorMailMask | SpecialPowers.Ci.nsIEditor.eEditorPlaintextMask;
const doc = iframe.contentDocument;
const mailEditor = getEditorMailSupport(win);
win.focus();
doc.body.focus();
const mailciteStyle = "white-space: pre-wrap; display: block; width: 98vw;";
const mailcite = SpecialPowers.unwrap(
mailEditor.insertAsCitedQuotation("This is a mail cite", "", false)
);
is(
doc.body.innerHTML,
`<span style="${mailciteStyle}">&gt; This is a mail cite<br><br></span><br><br>`,
"nsIEditorMailSupport.insertAsCitedQuotation() should insert a mailcite span"
);
// Split paragraph between "a " and "mail cite".
win.getSelection().collapse(mailcite.firstChild, "> This is a ".length);
doc.execCommand("insertParagraph");
is(
doc.body.innerHTML,
`<span style="${mailciteStyle}">&gt; This is a <br></span><br><span style="${mailciteStyle}">mail cite<br><br></span><br><br>`,
"insertParagraph in a mailcite should split the mailcite and insert an empty line"
);
// Then, type a character. The <br> before the latter mailcite should be
// preserved for the serializer to insert a line break before the latter
// mailcite.
doc.execCommand("insertText", false, "X");
is(
doc.body.innerHTML,
`<span style="${mailciteStyle}">&gt; This is a <br></span>X<br><span style="${mailciteStyle}">mail cite<br><br></span><br><br>`,
"Typing text into the empty line should preserve the preceding <br> of the latter mailcite"
);
SimpleTest.finish();
});
function getEditor(aWindow) {
const editingSession = SpecialPowers.wrap(aWindow).docShell.editingSession;
return editingSession.getEditorForWindow(aWindow);
}
function getEditorMailSupport(aWindow) {
return getEditor(aWindow).QueryInterface(SpecialPowers.Ci.nsIEditorMailSupport);
}
</script>
</head>
<body>
<iframe srcdoc="<body contenteditable><br><br></body>"></iframe>
</body>
</html>