When reviewing a document with tracked changes, sometimes we want to reject a change with history, which is currently hard to do on the UI. For a single insert, a workaround is to select the insert redline and then press delete, that'll create a delete redline on top of the insert one. Fix the problem by adding a new .uno:ReinstateTrackedChange UNO command that does this for the insert redline under cursor. More cases (e.g. handle all selected insert redlines) are still to be handled. Change-Id: I61dbe38bcfffc9a0a9cf009531d8bf28cfd1e13b Reviewed-on: https://gerrit.libreoffice.org/c/core/+/183115 Reviewed-by: Miklos Vajna <vmiklos@collabora.com> Tested-by: Jenkins