fix: make popup windows have a parent per default (#3836)

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

src/singletons/WindowManager.cpp

@@ -244,11 +244,31 @@ Window &WindowManager::getSelectedWindow()
     return *this->selectedWindow_;
 }
 
-Window &WindowManager::createWindow(WindowType type, bool show)
+Window &WindowManager::createWindow(WindowType type, bool show, QWidget *parent)
 {
     assertInGuiThread();
 
-    auto *window = new Window(type);
+    auto *const realParent = [this, type, parent]() -> QWidget * {
+        if (parent)
+        {
+            // If a parent is explicitly specified, we use that immediately.
+            return parent;
+        }
+
+        if (type == WindowType::Popup)
+        {
+            // On some window managers, popup windows require a parent to behave correctly. See
+            // https://github.com/Chatterino/chatterino2/pull/1843 for additional context.
+            return &(this->getMainWindow());
+        }
+
+        // If no parent is set and something other than a popup window is being created, we fall
+        // back to the default behavior of no parent.
+        return nullptr;
+    }();
+
+    auto *window = new Window(type, realParent);
+
     this->windows_.push_back(window);
     if (show)
     {

src/singletons/WindowManager.hpp

@@ -57,7 +57,8 @@ public:
 
     Window &getMainWindow();
     Window &getSelectedWindow();
-    Window &createWindow(WindowType type, bool show = true);
+    Window &createWindow(WindowType type, bool show = true,
+                         QWidget *parent = nullptr);
 
     void select(Split *split);
     void select(SplitContainer *container);

src/widgets/Window.cpp

@@ -43,8 +43,8 @@
 
 namespace chatterino {
 
-Window::Window(WindowType type)
-    : BaseWindow(BaseWindow::EnableCustomFrame)
+Window::Window(WindowType type, QWidget *parent)
+    : BaseWindow(BaseWindow::EnableCustomFrame, parent)
     , type_(type)
     , notebook_(new SplitNotebook(this))
 {

src/widgets/Window.hpp

@@ -21,7 +21,7 @@ class Window : public BaseWindow
     Q_OBJECT
 
 public:
-    explicit Window(WindowType type);
+    explicit Window(WindowType type, QWidget *parent);
 
     WindowType getType();
     SplitNotebook &getNotebook();