Debugging mir server/toolkit interactions

–window-management-trace

A feature added to the lp:miral trunk yesterday is making life a lot easier for developers working on MirAL based servers, and the toolkit extensions that support Mir. The feature is:

miral-shell --window-management-trace

Actually, the –window-management-trace switch will work with any MirAL base server (so miral-kiosk and egmde support it too).

What this does is cause the server to log every interaction with the window management policy – all the notifications it receives and all the calls it makes to the tools as a result.

This means that it is easy to find out that, for example, a “modal” gtk based dialog window is being created without specifying a parent. (Which is why the behaviour isn’t quite as expected – Mir servers will treat it as non-modal.)

To use this feature before the next MirAL release you do need build it yourself, but this only takes a minute (depending on your kit).It really is the easiest way to see exactly what is going on and why.