Properly adjust the visible editor rect and make limits respected, closes #8328

editor/editor_node.cpp

@@ -272,6 +272,8 @@ void EditorNode::_notification(int p_what) {
 		}
 		editor_selection->update();
 
+		scene_root->set_size_override(true, Size2(GlobalConfig::get_singleton()->get("display/window/width"), GlobalConfig::get_singleton()->get("display/window/height")));
+
 		ResourceImporterTexture::get_singleton()->update_imports();
 	}
 	if (p_what == NOTIFICATION_ENTER_TREE) {

scene/gui/control.cpp

@@ -1184,6 +1184,7 @@ Size2 Control::get_parent_area_size() const {
 
 		parent_size = get_viewport()->get_visible_rect().size;
 	}
+
 	return parent_size;
 }
 

scene/main/viewport.cpp

@@ -1156,6 +1156,7 @@ void Viewport::set_size_override(bool p_enable, const Size2 &p_size, const Vecto
 	size_override_margin = p_margin;
 	_update_rect();
 	_update_stretch_transform();
+	emit_signal("size_changed");
 }
 
 Size2 Viewport::get_size_override() const {