Use SOLVER_FLAG_FOCUS_NEW to install latests versions of deps

This is a new flag in the recent 0.7.30 release.

We previously tried to use `SOLVER_FLAG_FOCUS_BEST` but it turned out to
be too strong, this new flag should update packages only if it is
required for installing the latests versions of dependencies.

We had several reports where users expect this behavior.

This should properly resolve issue such as:
https://bugzilla.redhat.com/show_bug.cgi?id=2150300
https://issues.redhat.com/browse/RHEL-1374

dnf5.spec

@@ -116,7 +116,7 @@ Provides:       dnf5-command(versionlock)
 
 %global libmodulemd_version 2.5.0
 %global librepo_version 1.18.0
-%global libsolv_version 0.7.25
+%global libsolv_version 0.7.30
 %global sqlite_version 3.35.0
 %global swig_version 4
 %global zchunk_version 0.9.11

libdnf5/CMakeLists.txt

@@ -78,7 +78,7 @@ if (WITH_MODULEMD)
     target_link_libraries(libdnf5_static PRIVATE ${LIBMODULEMD_LIBRARIES})
 endif()
 
-pkg_check_modules(LIBSOLV REQUIRED libsolv>=0.7.25)
+pkg_check_modules(LIBSOLV REQUIRED libsolv>=0.7.30)
 list(APPEND LIBDNF5_PC_REQUIRES "${LIBSOLV_MODULE_NAME}")
 target_link_libraries(libdnf5 PRIVATE ${LIBSOLV_LIBRARIES})
 target_link_libraries(libdnf5_static PRIVATE ${LIBSOLV_LIBRARIES})

libdnf5/rpm/solv/goal_private.cpp

@@ -412,6 +412,9 @@ libdnf5::GoalProblem GoalPrivate::resolve() {
     libsolv_solver.set_flag(SOLVER_FLAG_ALLOW_VENDORCHANGE, vendor_change);
     libsolv_solver.set_flag(SOLVER_FLAG_DUP_ALLOW_VENDORCHANGE, vendor_change);
 
+    // Ensure the solver tries to install the latest versions of dependencies, even if it results in a bigger transaction
+    libsolv_solver.set_flag(SOLVER_FLAG_FOCUS_NEW, 1);
+
     if (libsolv_solver.solve(job)) {
         return libdnf5::GoalProblem::SOLVER_ERROR;
     }