[Linphone-developers] Linphone-Android spoils Unicode U+1Fxxx emoji characters

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When sending emojis in the range > 1Fxxx, they don't get properly encoded as four byte UTF8 sequences.

Setup: Fairphone 2 using latest snapshot,  SuseLeap42.2 using latest git commit

 

Test character:  U+1F602 😂 FACE WITH TEARS OF JOY

 

PC ->  Android receives correctly    f0 9f 98 82

 

Android V3.2.2-12:

Android ->  PC receives wrong sequence      ef bf bd  ef bf bd   (twice replacement char)

Android V3.2.2-10:

Android ->  PC receives wrong sequence     ed a0 bd ed b8 82   (surrogates D83D and DE02)