Function OH_TextConfig_SetPreviewTextSupport 

pub unsafe extern "C" fn OH_TextConfig_SetPreviewTextSupport(
    config: *mut InputMethod_TextConfig,
    supported: bool,
) -> InputMethod_ErrorCode

@brief Set preview text support into TextConfig.

@param config Represents a pointer to an {@link InputMethod_TextConfig} instance which will be set. @param supported Indicates whether the preview text is supported. @return Returns a specific error code. {@link IME_ERR_OK} - success. {@link IME_ERR_NULL_POINTER} - unexpected null pointer. Specific error codes can be referenced {@link InputMethod_ErrorCode}. @since 12