UI: Win32 - Restore Minimized App On WM_Close

Changes needed for Windows 10 to restore and show close dialog from minimized state.

https://developer.blender.org/D5107

Reviewed by Brecht Van Lommel

intern/ghost/intern/GHOST_SystemWin32.cpp

@@ -443,6 +443,13 @@ bool GHOST_SystemWin32::processEvents(bool waitForEvent)
       ::DispatchMessageW(&msg);
       hasEventHandled = true;
     }
+
+    /* PeekMessage above is allowed to dispatch messages to the wndproc without us
+     * noticing, so we need to check the event manager here to see if there are
+     * events waiting in the queue.
+     */
+    hasEventHandled |= this->m_eventManager->getNumEvents() > 0;
+
   } while (waitForEvent && !hasEventHandled);
 
   return hasEventHandled;
@@ -1453,7 +1460,10 @@ LRESULT WINAPI GHOST_SystemWin32::s_wndProc(HWND hwnd, UINT msg, WPARAM wParam,
         ////////////////////////////////////////////////////////////////////////
         case WM_CLOSE:
           /* The WM_CLOSE message is sent as a signal that a window
-           * or an application should terminate. */
+           * or an application should terminate. Restore if minimized. */
+          if (IsIconic(hwnd)) {
+            ShowWindow(hwnd, SW_RESTORE);
+          }
           event = processWindowEvent(GHOST_kEventWindowClose, window);
           break;
         case WM_ACTIVATE:

intern/ghost/intern/GHOST_WindowWin32.cpp

@@ -644,6 +644,9 @@ GHOST_TSuccess GHOST_WindowWin32::setOrder(GHOST_TWindowOrder order)
     hWndToRaise = ::GetWindow(m_hWnd, GW_HWNDNEXT); /* the window to raise */
   }
   else {
+    if (getState() == GHOST_kWindowStateMinimized) {
+      setState(GHOST_kWindowStateNormal);
+    }
     hWndInsertAfter = HWND_TOP;
     hWndToRaise = NULL;
   }