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The `eek/layersurface.c` file should be excluded because it's an imported, "foreign" source, but clang-tidy doesn't seem to have an annotation for that.

An alternative would have been to exclude it in Meson and do the check there, but that requires clang-tidy, raising the barrier to contribute of Squeekboard even more (it already requires libfeedback, which isn't packaged widely).

If the surface gets unmapped and mapped again we have another GDK window
so we have to reconfigure the layers surface on map and destroy it on
unmap.

This will be merged back into phosh if it works out.

As of commit 77bba4fcb2d836a58ccf8913d9a514aac6cc49a2. This allows
us to split the widget creation from making it visible.