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Delete the surrounding string of the preedit cursor.
imcontext_id The id of the IMContext. - Parameters:
-
| offset | The begining offset to remove from the cursor. |
| length | The length of the string to remove. |
- Returns:
- REVAL_FAILED when a serious error has occurred, or RETVAL_IGNORED if an timeout has happened. Otherwise it returns RETVAL_SUCCEEDED.
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