With the latest libreoffice-5-0 branch:
1) Start Writer.
2) Format -> page -> area -> fill -> bitmap
3) Select e.g. sky
4) Uncheck "tile"
5) Uncheck "autofit", OK to close the dialog
6) Save as ODF
styles.xml of the resulting .odt file has:
<style:page-layout-properties ... style:repeat="no-repeat">
<style:background-image ... style:repeat="stretch"/>
It's a task for the importer to decide in this case which one has priority, but we should not produce such output ourselves.
Michael Stahl committed a patch related to this issue.
It has been pushed to "libreoffice-5-0":
tdf#95569 xmloff: convert legacy assertions in PageMasterExportPropMapper
It will be available in 5.0.4.
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.
Master is not affected, the cleanup commit 18a712d2b3fe03629e00868ce17226994b7b7252 fixes this as a side-effect, setting both XML attributes to style:repeat="no-repeat" as expected.
It's now cherry-picked to libreoffice-5-0, marking as resolved.