Fix `unicode-bidi: plaintext` when there are forced breaks
The `unicode-bidi: plaintext`[1] computes the heuristic
direction for each "paragraph", separated by forced breaks.
However, non-first lines of each "paragraph" were using the
heuristic direction of the first "paragraph". This patch fixes
them to use the heuristic direction of the "paragraph" they
belong to.
[1]: https://drafts.csswg.org/css-writing-modes-3/#valdef-unicode-bidi-plaintext
Bug: 1193066
Change-Id: Ie73f662d76d16dea1122a41386c14f31d751f6ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2799874
Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#868803}
diff --git a/css/css-writing-modes/bidi-plaintext-br-001.html b/css/css-writing-modes/bidi-plaintext-br-001.html
new file mode 100644
index 0000000..0d96934
--- /dev/null
+++ b/css/css-writing-modes/bidi-plaintext-br-001.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<title>unicode-bidi: plaintext with forced breaks</title>
+<link rel="help" href='https://drafts.csswg.org/css-writing-modes-3/#valdef-unicode-bidi-plaintext'/>
+<link rel="match" href='reference/bidi-plaintext-br-001-ref.html'/>
+<link rel="author" title="Koji Ishii" href='mailto:kojii@chromium.org'/>
+<style>
+div.test {
+ font-family: Arial;
+ line-height: 1;
+ width: 10ch;
+ border: 1px solid blue;
+ unicode-bidi: plaintext;
+}
+</style>
+<body>
+ <div class="test">
+ אאאאאאאא
+ MMMMM
+ </div>
+ <div class="test">
+ MMMMM
+ אאאאאאאא
+ </div>
+ <div class="test">
+ a<br>
+ אאאאאאאא
+ MMMMM
+ </div>
+ <div class="test">
+ a<br>
+ MMMMM
+ אאאאאאאא
+ </div>
+ <div class="test">
+ א<br>
+ אאאאאאאא
+ MMMMM
+ </div>
+ <div class="test">
+ א<br>
+ MMMMM
+ אאאאאאאא
+ </div>
+</body>
diff --git a/css/css-writing-modes/reference/bidi-plaintext-br-001-ref.html b/css/css-writing-modes/reference/bidi-plaintext-br-001-ref.html
new file mode 100644
index 0000000..23bb3e9
--- /dev/null
+++ b/css/css-writing-modes/reference/bidi-plaintext-br-001-ref.html
@@ -0,0 +1,47 @@
+<!DOCTYPE html>
+<style>
+div.test {
+ font-family: Arial;
+ line-height: 1;
+ width: 10ch;
+ border: 1px solid blue;
+}
+</style>
+<body>
+ <div class="test" dir="rtl">
+ אאאאאאאא
+ MMMMM
+ </div>
+ <div class="test">
+ MMMMM
+ אאאאאאאא
+ </div>
+ <div class="test">
+ <div>a</div>
+ <div dir="rtl">
+ אאאאאאאא
+ MMMMM
+ </div>
+ </div>
+ <div class="test">
+ <div>a</div>
+ <div>
+ MMMMM
+ אאאאאאאא
+ </div>
+ </div>
+ <div class="test">
+ <div dir="rtl">א</div>
+ <div dir="rtl">
+ אאאאאאאא
+ MMMMM
+ </div>
+ </div>
+ <div class="test">
+ <div dir="rtl">א</div>
+ <div>
+ MMMMM
+ אאאאאאאא
+ </div>
+ </div>
+</body>
