With right click on application in Tasks widget there are recent documents shown. And for every one application they need to be deleted separately. Add option to permanently disable recent documents in Tasks widget on panel in all applications.
>Add option to permanently disable recent documents in Tasks widget on panel in all applications. Can you expand on what the problem we're trying to solve with this is?
If someone forgets to clear it manually other persons (for example at work) can see what documents or movies or pictures were at use.
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Not showing them in the task manager would not help. Every application may store its list of recently used documents in their history files, most of them being simple human-readable .ini files. Fixing this would require that applications stop remembering those documents. We have a framework for recent files, but not all applications are using it. See https://api.kde.org/frameworks/kio/html/classKRecentDocument.html I seem to remember we had a way to control this class via the Kiosk restrictions, but I let KIO maintainers investigate.
> Every application may store its list of recently used documents in their history files Yes. But this is kind of another story. Even when you clear recent documents in Kate there are still visible in task manager. If user wants to remove recent documents, he/she needs to remember about clearing them from two places. Besides, some applications, for example VLC, have option to disable recent files history.
To quote my own comment from https://bugs.kde.org/show_bug.cgi?id=353229: -- +1, also an issue for me. Maybe this could be resolved this way: Add an option to the respective Plasma panel, i.e. in "Configure Task Manager...". This option could be called something like "Keep Recent Documents" (yes/no). If turned off, the recent document history should be hidden _and_ deleted, so that when turned on again, there's no way of seeing the past history entries. If turned on again, it should start collecting the history from scratch (like it does for a new installation or user account).
In fact this option already exists in the Activities KCM: System Settings > Workspace Behavior > Activities > Privacy > Do Not Remember The problem is, this is pretty un-discoverable. I don't think most people would guess that the setting lives on the Activities page. That's a UI issue though that we'll track separately with Bug 416271.
*** This bug has been marked as a duplicate of bug 416271 ***