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Shift-click is equivalent to middle-click. This is mostly for
Windows users who may not have a middle button at all, but I've
replicated it in GTK to maintain cross-platform consistency.

[originally from svn r4166]

--- a/gtk.c

+++ b/gtk.c

@@ -181,10 +181,10 @@

     if (event->type != GDK_BUTTON_PRESS)

         return TRUE;

-    if (event->button == 1)

-	button = LEFT_BUTTON;

-    else if (event->button == 2)

+    if (event->button == 2 || (event->state & GDK_SHIFT_MASK))

 	button = MIDDLE_BUTTON;

+    else if (event->button == 1)

+	button = LEFT_BUTTON;

     else if (event->button == 3)

 	button = RIGHT_BUTTON;

     else

--- a/windows.c

+++ b/windows.c

@@ -438,12 +438,25 @@

       case WM_LBUTTONDOWN:

       case WM_RBUTTONDOWN:

       case WM_MBUTTONDOWN:

-	if (!midend_process_key(fe->me, LOWORD(lParam), HIWORD(lParam),

-				(message == WM_LBUTTONDOWN ? LEFT_BUTTON :

-				 message == WM_RBUTTONDOWN ? RIGHT_BUTTON :

-				 MIDDLE_BUTTON)))

-	    PostQuitMessage(0);

-	

+	{

+	    int button;

+

+	    /*

+	     * Shift-clicks count as middle-clicks, since otherwise

+	     * two-button Windows users won't have any kind of

+	     * middle click to use.

+	     */

+	    if (message == WM_MBUTTONDOWN || (wParam & MK_SHIFT))

+		button = MIDDLE_BUTTON;

+	    else if (message == WM_LBUTTONDOWN)

+		button = LEFT_BUTTON;

+	    else

+		button = RIGHT_BUTTON;

+		

+	    if (!midend_process_key(fe->me, LOWORD(lParam),

+				    HIWORD(lParam), button))

+		PostQuitMessage(0);

+	}

 	break;

       case WM_CHAR:

 	if (!midend_process_key(fe->me, 0, 0, (unsigned char)wParam))