test build:2.6.0.v20100329-0630

steps to reproduce:
1. insert embedded image to report and export it to library.
2. open the library, delete the image item but keep the embedded image content under embedded image node in outline.
3. back to report, change embedded image's name in property editor and export it to library.
4. choose no in confirm replace dialog
5. open library file

expected result:
no image item in library

current behavior:
image item is exported.
this is the correct behavior. the confirmation is only for embedded image, not for image item.
confirm dialog is for embedded image content,
click cancel will cancel the export action