ProjectExplorer: Make imported buildconfiguration active

Make the new buildconfiguration active after it was imported via
Project Mode. Before the buildconfiguration was added but the
current one was still set, which lead people to believe that the
build directory was wrong.

Task-number: QTCREATORBUG-18082
Change-Id: I10412d94326d9e21820dfcac89adbe2c5da948ae
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/projectexplorer/projectwindow.cpp

@@ -548,6 +548,8 @@ public:
                                                               dir);
         FileName path = FileName::fromString(importDir);
 
+        Target *lastTarget = nullptr;
+        BuildConfiguration *lastBc = nullptr;
         const QList<BuildInfo *> toImport = projectImporter->import(path, false);
         for (BuildInfo *info : toImport) {
             Target *target = project->target(info->kitId);
@@ -561,8 +563,16 @@ public:
                 BuildConfiguration *bc = info->factory()->create(target, info);
                 QTC_ASSERT(bc, continue);
                 target->addBuildConfiguration(bc);
+
+                lastTarget = target;
+                lastBc = bc;
             }
         }
+        if (lastTarget && lastBc) {
+            SessionManager::setActiveBuildConfiguration(lastTarget, lastBc, SetActive::Cascade);
+            SessionManager::setActiveTarget(project, lastTarget, SetActive::Cascade);
+        }
+
         qDeleteAll(toImport);
     }