ProjectExplorer: allow selecting targets without build config

Workspace projects do not have a build configuration by default, but a
user might be interested in selecting different kits and manually create
build steps.

Change-Id: I641dc849f7f216201a1a6c0b51e73ce9c8c6b9ad
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/projectexplorer/targetsetupwidget.cpp

@@ -99,11 +99,11 @@ bool TargetSetupWidget::isKitSelected() const
 
 void TargetSetupWidget::setKitSelected(bool b)
 {
-    // Only check target if there are build configurations possible
-    b &= hasSelectedBuildConfigurations();
     const GuardLocker locker(m_ignoreChanges);
     m_detailsWidget->setChecked(b);
-    m_detailsWidget->setState(b ? DetailsWidget::Expanded : DetailsWidget::Collapsed);
+    m_detailsWidget->setState(
+        b && hasSelectableBuildConfigurations() ? DetailsWidget::Expanded
+                                                : DetailsWidget::Collapsed);
     m_detailsWidget->widget()->setEnabled(b);
 }
 
@@ -236,16 +236,16 @@ const QList<BuildInfo> TargetSetupWidget::buildInfoList(const Kit *k, const File
     return {info};
 }
 
-bool TargetSetupWidget::hasSelectedBuildConfigurations() const
+bool TargetSetupWidget::hasSelectableBuildConfigurations() const
 {
-    return !selectedBuildInfoList().isEmpty();
+    return !m_infoStore.empty();
 }
 
 void TargetSetupWidget::toggleEnabled(bool enabled)
 {
-    m_detailsWidget->widget()->setEnabled(enabled && hasSelectedBuildConfigurations());
+    m_detailsWidget->widget()->setEnabled(enabled);
     m_detailsWidget->setCheckable(enabled);
-    m_detailsWidget->setExpandable(enabled);
+    m_detailsWidget->setExpandable(enabled && hasSelectableBuildConfigurations());
     if (!enabled) {
         m_detailsWidget->setState(DetailsWidget::Collapsed);
         m_detailsWidget->setChecked(false);
@@ -254,6 +254,12 @@ void TargetSetupWidget::toggleEnabled(bool enabled)
 
 const QList<BuildInfo> TargetSetupWidget::selectedBuildInfoList() const
 {
+    if (m_infoStore.empty()) {
+        BuildInfo info;
+        info.kitId = m_kit->id();
+        return {info};
+    }
+
     QList<BuildInfo> result;
     for (const BuildInfoStore &store : m_infoStore) {
         if (store.isEnabled)

src/plugins/projectexplorer/targetsetupwidget.h

@@ -57,7 +57,7 @@ signals:
 private:
     static const QList<BuildInfo> buildInfoList(const Kit *k, const Utils::FilePath &projectPath);
 
-    bool hasSelectedBuildConfigurations() const;
+    bool hasSelectableBuildConfigurations() const;
 
     void toggleEnabled(bool enabled);
     void checkBoxToggled(QCheckBox *checkBox, bool b);