Force minimum stack size to 1Mb for Xlib.

dlls/kernel/thread.c

@@ -62,6 +62,7 @@ TEB *THREAD_InitStack( TEB *teb, DWORD stack_size )
     void *base;
 
     stack_size = (stack_size + (page_size - 1)) & ~(page_size - 1);
+    if (stack_size < 1024 * 1024) stack_size = 1024 * 1024;  /* Xlib needs a large stack */
 
     if (!(base = VirtualAlloc( NULL, stack_size, MEM_COMMIT, PAGE_EXECUTE_READWRITE )))
         return NULL;

dlls/ntdll/thread.c

@@ -259,6 +259,7 @@ NTSTATUS WINAPI RtlCreateUserThread( HANDLE process, const SECURITY_DESCRIPTOR *
     }
     if (stack_reserve < stack_commit) stack_reserve = stack_commit;
     stack_reserve = (stack_reserve + 0xffff) & ~0xffff;  /* round to 64K boundary */
+    if (stack_reserve < 1024 * 1024) stack_reserve = 1024 * 1024;  /* Xlib needs a large stack */
 
     info->stack_base = NULL;
     info->stack_size = stack_reserve;