When I hit Ctrl-Shift-ArrowRight it generates U+200E, Left-to-Right Mark, i.e. going towards the right, i.e. normal (for me, an English speaker).
When I hit Ctrl-Shift-ArrowLeft it generates U+200F, Right-to-Left Mark, i.e. going towards the left.
You can check that the correct codes are being generated using my UsbMode.apk
How an edit box or a text editor is supposed to react, I don't know.
I can see that when I use my plain text editor those two control codes are in there.
Maybe the Ctrl-Shift-ArrowLeft toggles on/off RTL mode?
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