CMake: Apply build directory change on editingFinished

Otherwise every time a character is typed, a dialog pops up, and that
dialog is closed without triggering a cmake run, the value is reset.

Add that behavior optionally to StringAspect.

Change-Id: I6831d1622f08acae6df43d4ceb2bf7367c96a747
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildconfiguration.cpp

@@ -182,6 +182,7 @@ CMakeBuildSettingsWidget::CMakeBuildSettingsWidget(CMakeBuildConfiguration *bc)
     container->setWidget(details);
 
     auto buildDirAspect = bc->buildDirectoryAspect();
+    buildDirAspect->setAutoApplyOnEditingFinished(true);
     connect(buildDirAspect, &BaseAspect::changed, this, [this]() {
         m_configModel->flush(); // clear out config cache...;
     });
@@ -851,7 +852,7 @@ CMakeBuildConfiguration::CMakeBuildConfiguration(Target *target, Id id)
                 return newDir;
 
             if (QDir(oldDir).exists("CMakeCache.txt") && !QDir(newDir).exists("CMakeCache.txt")) {
-                if (QMessageBox::information(nullptr,
+                if (QMessageBox::information(Core::ICore::dialogParent(),
                                              tr("Changing Build Directory"),
                                              tr("Change the build directory and start with a "
                                                 "basic CMake configuration?"),