Add parent to ChannelFilterEditorDialog (#2232)

src/widgets/dialogs/ChannelFilterEditorDialog.hpp

@@ -4,7 +4,7 @@ namespace chatterino {
 class ChannelFilterEditorDialog : public QDialog
 {
 public:
-    ChannelFilterEditorDialog(QWidget *parent = nullptr);
+    ChannelFilterEditorDialog(QWidget *parent);
 
     const QString getFilter() const;
     const QString getTitle() const;

src/widgets/settingspages/FiltersPage.cpp

@@ -2,7 +2,9 @@
 
 #include "controllers/filters/FilterModel.hpp"
 #include "singletons/Settings.hpp"
+#include "singletons/WindowManager.hpp"
 #include "util/LayoutCreator.hpp"
+#include "widgets/Window.hpp"
 #include "widgets/dialogs/ChannelFilterEditorDialog.hpp"
 #include "widgets/helper/EditableModelView.hpp"
 
@@ -40,7 +42,8 @@ FiltersPage::FiltersPage()
     });
 
     view->addButtonPressed.connect([] {
-        ChannelFilterEditorDialog d;
+        ChannelFilterEditorDialog d(
+            static_cast<QWidget *>(&(getApp()->windows->getMainWindow())));
         if (d.exec() == QDialog::Accepted)
         {
             getSettings()->filterRecords.append(