Add SB_OpenHomeWindowWhenLastProjectClosed option

Author: CrSjimo

src/plugins/coreplugin/internal/BehaviorPreference.cpp

@@ -58,7 +58,7 @@ namespace Core::Internal {
         Q_D(BehaviorPreference);
         auto settings = RuntimeInterface::settings();
         settings->beginGroup(staticMetaObject.className());
-        d->startupBehavior = settings->value("startupBehavior", QVariant::fromValue(SB_CloseHomeWindowAfterOpeningProject)).value<StartupBehavior>();
+        d->startupBehavior = settings->value("startupBehavior", QVariant::fromValue(SB_CloseHomeWindowAfterOpeningProject | SB_OpenHomeWindowWhenLastProjectClosed)).value<StartupBehavior>();
         emit startupBehaviorChanged();
         d->useSystemLanguage = settings->value("useSystemLanguage", true).toBool();
         emit useSystemLanguageChanged();

src/plugins/coreplugin/internal/BehaviorPreference.h

@@ -62,6 +62,7 @@ namespace Core::Internal {
         enum StartupBehaviorFlag {
             SB_CreateNewProject = 0x01,
             SB_CloseHomeWindowAfterOpeningProject = 0x02,
+            SB_OpenHomeWindowWhenLastProjectClosed = 0x04,
         };
         Q_ENUM(StartupBehaviorFlag)
         Q_DECLARE_FLAGS(StartupBehavior, StartupBehaviorFlag)

src/plugins/coreplugin/internal/CorePlugin.cpp

@@ -298,6 +298,29 @@ namespace Core::Internal {
         ProjectWindowInterfaceRegistry::instance()->attach<ProjectWindowNavigatorAddOn>();
         ProjectWindowInterfaceRegistry::instance()->attach<AfterSavingNotifyAddOn>();
         ProjectWindowInterfaceRegistry::instance()->attach<CloseSaveCheckAddOn>();
+
+        auto windowSystem = CoreInterface::windowSystem();
+        connect(windowSystem, &WindowSystem::windowAboutToDestroy, this, [](WindowInterface *windowInterface) {
+            if (!qobject_cast<ProjectWindowInterface *>(windowInterface)) {
+                return;
+            }
+
+            const auto startupBehavior = BehaviorPreference::startupBehavior();
+            const bool closeHomeAfterOpening = startupBehavior & BehaviorPreference::SB_CloseHomeWindowAfterOpeningProject;
+            const bool reopenHomeOnLastProjectClosed = startupBehavior & BehaviorPreference::SB_OpenHomeWindowWhenLastProjectClosed;
+
+            if (closeHomeAfterOpening && !reopenHomeOnLastProjectClosed) {
+                return;
+            }
+
+            const bool hasOtherProjectWindow = std::ranges::any_of(CoreInterface::windowSystem()->windows(), [](auto w) {
+                return qobject_cast<ProjectWindowInterface *>(w);
+            });
+
+            if (!hasOtherProjectWindow) {
+                CoreInterface::showHome();
+            }
+        });
     }
 
     void CorePlugin::initializeBehaviorPreference() {

src/plugins/coreplugin/internal/CorePlugin.h

@@ -25,7 +25,7 @@ namespace Core::Internal {
         void initializeSingletons();
         static void initializeActions();
         void initializeSettings() const;
-        static void initializeWindows();
+        void initializeWindows();
         static void initializeBehaviorPreference();
         static void initializeColorScheme();
         static void initializeJumpList();

src/plugins/coreplugin/qml/settings/GeneralPage.qml

@@ -103,6 +103,20 @@ ScrollView {
                             }
                         }
                     }
+                    CheckBox {
+                        Layout.leftMargin: 22
+                        text: qsTr("Reopen the home window when the last project window closes")
+                        TextMatcherItem on text { matcher: page.matcher }
+                        checked: page.startupBehavior & BehaviorPreference.SB_OpenHomeWindowWhenLastProjectClosed
+                        enabled: page.startupBehavior & BehaviorPreference.SB_CloseHomeWindowAfterOpeningProject
+                        onClicked: () => {
+                            if (checked) {
+                                page.startupBehavior |= BehaviorPreference.SB_OpenHomeWindowWhenLastProjectClosed
+                            } else {
+                                page.startupBehavior &= ~BehaviorPreference.SB_OpenHomeWindowWhenLastProjectClosed
+                            }
+                        }
+                    }
                 }
             }
             GroupBox {