[IE] selection range lost when pasting with dialog

[Garry Yao]

1. Load the "replacebyclass" sample;
2. Select the bold text "sample text";
3. Press Tab key to move focus outside of editor;
4. Click on "Paste" toolbar button, choose to deny clipboard access in order to bring up dialog.
5. Fill in the dialog will some text then click on Ok
   • Actual: Text is appended to the end of document;
   • Expected: Text is inserted at the range point with previously selected content removed.

[Garry Yao]

Regression of [7383].

[Garry Yao]

Fixed with [7447].