winhelp: pointer coordinates are relative to richedit text window, not the main window

[Kirill K. Smirnov]

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diff --git a/programs/winhelp/winhelp.c b/programs/winhelp/winhelp.c
index ee21053..27d46e1 100644
--- a/programs/winhelp/winhelp.c
+++ b/programs/winhelp/winhelp.c
@@ -1001,7 +1001,8 @@ static LRESULT CALLBACK WINHELP_MainWndProc(HWND hWnd, UINT msg, WPARAM wParam,
                         }
                         pt.x = (int)(short)LOWORD(msgf->lParam);
                         pt.y = (int)(short)HIWORD(msgf->lParam);
-                        ClientToScreen(hWnd, &pt);
+                        hTextWnd = GetDlgItem(win->hMainWnd, CTL_ID_TEXT);
+                        ClientToScreen(hTextWnd, &pt);
                         TrackPopupMenu(GetSubMenu(hMenu, 0), TPM_LEFTALIGN|TPM_TOPALIGN,
                                        pt.x, pt.y, 0, hWnd, NULL);
                         DestroyMenu(hMenu);