Recommit r668, which got undone accidentally by r673.

src/common/version.h

 #define MAJOR_VERSION 0
 #define MINOR_VERSION 0
 #define BUILD_VERSION 0
-#define BUILD_REVISION 682
+#define BUILD_REVISION 683
 
 #define STRINGIFY(x) #x
 #define MACRO_STRINGIFY(x) STRINGIFY(x)

src/libEGL/Surface.cpp

@@ -167,6 +167,16 @@ bool Surface::resetSwapChain(int backbufferWidth, int backbufferHeight)
 
     bool useFlipEx = (LOWORD(GetVersion()) >= 0x61) && mDisplay->isD3d9ExDevice();
 
+    // FlipEx causes unseemly stretching when resizing windows AND when one
+    // draws outside of the WM_PAINT callback. While this is seldom a problem in
+    // single process applications, it is particuarly noticeable in multiprocess
+    // applications. Therefore, if the creator process of our window is not in
+    // the current process, disable use of FlipEx.
+    DWORD windowPID;
+    GetWindowThreadProcessId(mWindow, &windowPID);
+    if(windowPID != GetCurrentProcessId())
+      useFlipEx = false;
+
     presentParameters.AutoDepthStencilFormat = mConfig->mDepthStencilFormat;
     // We set BackBufferCount = 1 even when we use D3DSWAPEFFECT_FLIPEX.
     // We do this because DirectX docs are a bit vague whether to set this to 1