Many texts are bidi now (show cursor with flag in edit mode)

since 

-QTBUG-57743-

http://code.qt.io/cgit/qt/qtbase.git/commit/src/gui/text/qtextengine.cpp?h=dev&id=7f504283ef44c35dfca7198a80742063a940fabd

many texts are bidi now

this line identify every string as bidi when it has unicode character >= 0x590

http://code.qt.io/cgit/qt/qtbase.git/tree/src/gui/text/qtextengine.cpp?h=dev#n1047

so when I wrote something in japan => it is bidi text now

As consequence text cursor is flag instead of pure line

How to reproduce:

Just type in japan in qt creator(4.7.0)

there is small flag next to the cursor

or

Simple example app with QTextEdit 

When you enter Shift+Enter new line in QTextEdit

or when you change keyboard to japan and when you write something in japan

cursor has flag now

I didn't test other OSs but it should be same everywhere.