Automatically applying components based on crash stacktrace and information from OWNERS files.

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Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/7bd29404a6ab8d36bdff4123ae522fcd9068344b ([Blink] Avoid crossing editing boundaries selection.).

If this is incorrect, please let us know why and apply the Test-Predator-Wrong-CLs label. If you aren't the correct owner for this issue, please unassign yourself as soon as possible so it can be re-triaged.

From the spec [1], <rtc> should be a child of a <ruby> element, the test case indicates that Blink didn't enforce that; from MDN, Blink doesn't support <rtc> yet, not sure what's the progress in Blink though.

In [2], end_of_selection(new_selection.VisibleEnd()) is null even new_selection.End() is a valid position. See new_selection.ShowTreeForThis() below:

BODY (editable)
S	TABLE (editable)
		#text "\n"
	#text "\n"
	RTC (editable)
		#text "\n"
E		RT
			#text "\n"
			RUBY (editable)
				#text "\n"
			#text "\n"
			RUBY (editable)
start: offsetInAnchor[0]
end: offsetInAnchor[0]

Probably not related to my CL, xiaochengh@, yosin@, could you have a look, thanks!

[1] https://www.w3.org/TR/html52/textlevel-semantics.html#the-rtc-element
[2] https://chromium.googlesource.com/chromium/src/+/bc9185c627f678ff37431b6e9e112f72cabe0f4d/third_party/blink/renderer/core/editing/commands/editing_commands_utilities.cc#447

P3 due to low usage of InsertOrderedList command and unusual HTML.