1 files changed, 32 insertions, 2 deletions

diff --git a/indra/llwindow/llwindowwin32.cpp b/indra/llwindow/llwindowwin32.cpp
index 30f5526500..5106da09b2 100755
--- a/indra/llwindow/llwindowwin32.cpp
+++ b/indra/llwindow/llwindowwin32.cpp
@@ -85,6 +85,18 @@ void show_window_creation_error(const std::string& title)
 	LL_WARNS("Window") << title << LL_ENDL;
 }
 
+HGLRC SafeCreateContext(HDC hdc)
+{
+	__try 
+	{
+		return wglCreateContext(hdc);
+	}
+	__except(EXCEPTION_EXECUTE_HANDLER)
+	{ 
+		return NULL;
+	}
+}
+
 //static
 BOOL LLWindowWin32::sIsClassRegistered = FALSE;
 
@@ -1166,14 +1178,15 @@ BOOL LLWindowWin32::switchContext(BOOL fullscreen, const LLCoordScreen &size, BO
 		return FALSE;
 	}
 
-	if (!(mhRC = wglCreateContext(mhDC)))
+
+	if (!(mhRC = SafeCreateContext(mhDC)))
 	{
 		close();
 		OSMessageBox(mCallbacks->translateString("MBGLContextErr"),
 			mCallbacks->translateString("MBError"), OSMB_OK);
 		return FALSE;
 	}
-
+		
 	if (!wglMakeCurrent(mhDC, mhRC))
 	{
 		close();
@@ -1831,6 +1844,10 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
 	// This helps prevent avatar walking after maximizing the window by double-clicking the title bar.
 	static bool sHandleLeftMouseUp = true;
 
+	// Ignore the double click received right after activating app.
+	// This is to avoid triggering double click teleport after returning focus (see MAINT-3786).
+	static bool sHandleDoubleClick = true;
+
 	LLWindowWin32 *window_imp = (LLWindowWin32 *)GetWindowLong(h_wnd, GWL_USERDATA);
 
 
@@ -1958,6 +1975,11 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
 					}
 				}
 
+				if (!activating)
+				{
+					sHandleDoubleClick = false;
+				}
+
 				window_imp->mCallbacks->handleActivateApp(window_imp, activating);
 
 				break;
@@ -2182,6 +2204,7 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
 				window_imp->mCallbacks->handlePingWatchdog(window_imp, "Main:WM_NCLBUTTONDOWN");
 				// A click in a non-client area, e.g. title bar or window border.
 				sHandleLeftMouseUp = false;
+				sHandleDoubleClick = true;
 			}
 			break;
 
@@ -2226,6 +2249,13 @@ LRESULT CALLBACK LLWindowWin32::mainWindowProc(HWND h_wnd, UINT u_msg, WPARAM w_
 		//case WM_RBUTTONDBLCLK:
 			{
 				window_imp->mCallbacks->handlePingWatchdog(window_imp, "Main:WM_LBUTTONDBLCLK");
+
+				if (!sHandleDoubleClick)
+				{
+					sHandleDoubleClick = true;
+					break;
+				}
+
 				// Because we move the cursor position in the app, we need to query
 				// to find out where the cursor at the time the event is handled.
 				// If we don't do this, many clicks could get buffered up, and if the