question about xdg shell version

[zou lan]

Hi pekka & all

I find weston support many xdg shell versions in different weston versions,
as far as I know,
applications only use the genernal xdg shell interfaces to create a window,
for example, waylandsink. If the weston upgrade, should the applications
modify its xdg shell interface or are they  just backward compatible. Does
weston only support stable/xdg-shell.xml in the future?  How could make
weston upgrade not impact applications?

Thank you!

Best Regards
Nancy
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