Each project listed in a .sln must be marked (or not) as part of the
"default build" for each configuration. For targets created by the
add_custom_target() command we add them to the default build if they
are not excluded in some way or if another target depends on them.
In the top-level .sln, a custom target is excluded if it is not
created with the ALL option to add_custom_target. In subdirectory
.sln files, a target may also be excluded if it is not within the
directory and is brought into the solution only due to a dependency
from another target in the solution.
Fix the "IsPartOfDefaultBuild" and "IsDependedOn" methods to check
every target to be included in the .sln for a dependency on the
custom target. Otherwise transitive dependencies through targets
not in the current subdirectory will not be considered.
Extend the SubProject test with a custom target to cover this case.
Reported-by: William Deurwaarder <William.Deurwaarder@tomtom.com>
Reported-by: Dirk Steenpass <dirk.steenpass@gmail.com>
