From 661f4897b297fb529ec372ec14f42696ccdacb94 Mon Sep 17 00:00:00 2001
From: David Capello <david@igarastudio.com>
Date: Tue, 20 Oct 2020 09:50:27 -0300
Subject: [PATCH] Check that we're in the UI thread when modifying the widgets
 collection

---
 src/ui/intern.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/ui/intern.cpp b/src/ui/intern.cpp
index 75f3e94aa..96d490d61 100644
--- a/src/ui/intern.cpp
+++ b/src/ui/intern.cpp
@@ -1,4 +1,5 @@
 // Aseprite UI Library
+// Copyright (C) 2020  Igara Studio S.A.
 // Copyright (C) 2001-2017  David Capello
 //
 // This file is released under the terms of the MIT license.
@@ -9,6 +10,7 @@
 #endif
 
 #include "ui/manager.h"
+#include "ui/system.h"
 #include "ui/theme.h"
 #include "ui/widget.h"
 #include "ui/window.h"
@@ -22,21 +24,29 @@ static std::list<Widget*>* widgets;
 
 void initWidgets()
 {
+  assert_ui_thread();
+
   widgets = new std::list<Widget*>;
 }
 
 void exitWidgets()
 {
+  assert_ui_thread();
+
   delete widgets;
 }
 
 void addWidget(Widget* widget)
 {
+  assert_ui_thread();
+
   widgets->push_back(widget);
 }
 
 void removeWidget(Widget* widget)
 {
+  assert_ui_thread();
+
   ASSERT(!Manager::widgetAssociatedToManager(widget));
 
   auto it = std::find(widgets->begin(), widgets->end(), widget);
@@ -46,6 +56,8 @@ void removeWidget(Widget* widget)
 
 void reinitThemeForAllWidgets()
 {
+  assert_ui_thread();
+
   // Reinitialize the theme of each widget
   auto theme = get_theme();
   for (auto widget : *widgets)