Fix a rare drag/drop issue

src/framework/stdext/exception.h

@@ -42,10 +42,7 @@ protected:
 };
 
 /// Throws a generic exception
-template<typename... T>
-void throw_exception(const std::string& what) {
-    throw exception(what);
-}
+inline void throw_exception(const std::string& what) { throw exception(what); }
 
 }
 

src/framework/ui/uimanager.cpp

@@ -133,7 +133,7 @@ void UIManager::inputEvent(const InputEvent& event)
             }
 
             // mouse move can change hovered widgets
-            updateHoveredWidget();
+            updateHoveredWidget(true);
 
             // first fire dragging move
             if(m_draggingWidget) {
@@ -209,12 +209,12 @@ bool UIManager::updateDraggingWidget(const UIWidgetPtr& draggingWidget, const Po
     return accepted;
 }
 
-void UIManager::updateHoveredWidget()
+void UIManager::updateHoveredWidget(bool now)
 {
-    if(m_hoverUpdateScheduled)
+    if(m_hoverUpdateScheduled && !now)
         return;
 
-    g_dispatcher.addEvent([this] {
+    auto func = [this] {
         if(!m_rootWidget)
             return;
 
@@ -235,8 +235,14 @@ void UIManager::updateHoveredWidget()
                 hoveredWidget->onHoverChange(true);
             }
         }
-    });
-    m_hoverUpdateScheduled = true;
+    };
+
+    if(now)
+        func();
+    else {
+        m_hoverUpdateScheduled = true;
+        g_dispatcher.addEvent(func);
+    }
 }
 
 void UIManager::onWidgetAppear(const UIWidgetPtr& widget)

src/framework/ui/uimanager.h

@@ -41,7 +41,7 @@ public:
 
     void updatePressedWidget(const UIWidgetPtr& newPressedWidget, const Point& clickedPos = Point());
     bool updateDraggingWidget(const UIWidgetPtr& draggingWidget, const Point& clickedPos = Point());
-    void updateHoveredWidget();
+    void updateHoveredWidget(bool now = false);
 
     void clearStyles();
     bool importStyle(const std::string& file);