Since my upgrade to 4.14.22 (Kubuntu 16.04LTS) I see a change in sidebar click behaviour. Shift+Click does not open in a new window nor Ctrl+Click in a new tab. This is inconsistent in behaviour with Ctrl or Shift clicking in the Bookmark menu it opens in a new tab or window respectively. Not sure if this a Kubuntu specific bug.
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I installed the indicated newer version. There no longer is a sidebar of any kind. That is another way of bug fixing; just remove the buggy code until nothing is left.
(In reply to René from comment #2) > I installed the indicated newer version. There no longer is a sidebar of any > kind. That is another way of bug fixing; just remove the buggy code until > nothing is left. Which version did you install?