Improve the memory footprint of the search index rebuild (see #5681)
Update the example website style sheet
Do not offer to install extensions which are older than the installed version
Handle all possible errors when uploading files (see #5934)
Backport the changes from e44864d2 (see #5683)
Update TCPDF to version 6.0.010 (see #5676)
Allow to paste into the root page in "edit multiple" mode (see #5620)
Bump the version number
Merge branch 'hotfix/2.11.12' into lts
injected composer.json
updated composer.json