add an action that changes the focus from a selected element in Xtext to the same element in sirius (or other editor)

we have example of code that open xtext editor from the sirius editor (cf. https://github.com/dvojtise/mde-crashcourse-logo/blob/master/part3-mmfirst-solution/fr.inria.sed.logo.design/src/fr/inria/sed/logo/design/Services.java)

it would be interresting to have the opposite feature too. I.e from xtext, right click on a part of the text would open a popup in order to open the sirius editor and selecting the corresponding element in the diagram(s)