IJ with accent

[a.lukyanov]

Dutch language writing uses the ligature ij (U+0132, U+0133). When 
accented, it should take an accent on each component, like this:


If one uses two separate characters (i+j), one can put an accent on each 
character (íj́).

However, if monolithic ligature ij is used, how one can accent it 
correctly? Unicode standard does not answer this.

Probably one should use the sequence U+0133 U+301, with the accent 
doubling automatically, but this is not implemented (ij́).