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Delete the surrounding text of an IMContext. The string reffered as "the surrounding text" here is the string gotten by get_surrounding_text () previously.
- Parameters:
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| imcontext | The IMContext. |
| offset | The begining offset (in wchar) of the part of the surrounding string to remove. |
| length | The length (in wchar) of the part of the surrounding string to remove. |
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