riched20: Enable the dialog mode after receiving WM_GETDLGCODE message.

dlls/riched20/editor.c

@@ -2665,6 +2665,7 @@ ME_TextEditor *ME_MakeEditor(ITextHost *texthost, BOOL bEmulateVersion10)
   ed->mode |= (props & TXTBIT_RICHTEXT) ? TM_RICHTEXT : TM_PLAINTEXT;
   ed->AutoURLDetect_bEnable = FALSE;
   ed->bHaveFocus = FALSE;
+  ed->bDialogMode = FALSE;
   ed->bMouseCaptured = FALSE;
   for (i=0; i<HFONT_CACHE_SIZE; i++)
   {
@@ -3008,6 +3009,8 @@ LRESULT ME_HandleMessage(ME_TextEditor *editor, UINT msg, WPARAM wParam,
   case WM_GETDLGCODE:
   {
     UINT code = DLGC_WANTCHARS|DLGC_WANTTAB|DLGC_WANTARROWS|DLGC_HASSETSEL;
+    if (lParam)
+      editor->bDialogMode = TRUE;
     if (editor->styleFlags & ES_MULTILINE)
       code |= DLGC_WANTMESSAGE;
     return code;

dlls/riched20/editstr.h

@@ -370,6 +370,7 @@ typedef struct tagME_TextEditor
   BOOL AutoURLDetect_bEnable;
   WCHAR cPasswordMask;
   BOOL bHaveFocus;
+  BOOL bDialogMode; /* Indicates that we are inside a dialog window */
   /*for IME */
   int imeStartIndex;
   DWORD selofs; /* The size of the selection bar on the left side of control */