Lots of fixes and added more dialogs

dialogs/extensionpackagesdialog.cpp

@@ -1,6 +1,8 @@
 #include "extensionpackagesdialog.h"
 #include "ui_extensionpackagesdialog.h"
 
+#include "installextensiondialog.h"
+
 ExtensionPackagesDialog::ExtensionPackagesDialog(QWidget *parent) :
     QDialog{parent},
     m_ui{std::make_unique<Ui::ExtensionPackagesDialog>()}
@@ -8,7 +10,7 @@ ExtensionPackagesDialog::ExtensionPackagesDialog(QWidget *parent) :
     m_ui->setupUi(this);
 
 #ifdef Q_OS_LINUX
-    setWindowFlags(windowFlags() & ~Qt::Dialog | Qt::Window);
+    setWindowFlags((windowFlags() & ~Qt::Dialog) | Qt::Window);
 #endif
     setWindowFlag(Qt::WindowCloseButtonHint);
 
@@ -16,8 +18,19 @@ ExtensionPackagesDialog::ExtensionPackagesDialog(QWidget *parent) :
         button->setIcon(QIcon{":/qtgameengine/icons/ok.png"});
     if (auto button = m_ui->buttonBox->button(QDialogButtonBox::Cancel))
         button->setIcon(QIcon{":/qtgameengine/icons/delete.png"});
-    m_ui->buttonBox->addButton(tr("Install"), QDialogButtonBox::ActionRole)
-        ->setIcon(QIcon{":/qtgameengine/icons/extension-packages-file.png"});
+
+    if (auto button = m_ui->buttonBox->addButton(tr("Install"), QDialogButtonBox::ActionRole))
+    {
+        button->setIcon(QIcon{":/qtgameengine/icons/extension-packages-file.png"});
+        connect(button, &QAbstractButton::clicked,
+                this, &ExtensionPackagesDialog::install);
+    }
 }
 
 ExtensionPackagesDialog::~ExtensionPackagesDialog() = default;
+
+void ExtensionPackagesDialog::install()
+{
+    InstallExtensionDialog dialog{this};
+    dialog.exec();
+}