SUMMARY Clearing clipboard history does not clear the clipboard content. STEPS TO REPRODUCE 0. Open Kate, input some text. 1. Copy the text into clipboard. 2. Clear the Plasma's clipboard. 3. Try pasting the clipboard content into Kate (it will paste). OR 0. Open Dolphin, select a file. 1. Copy the file. 2. Clear the Plasma's clipboard. 3. Open context menu in Dolphin, notice you can still "Paste One File". OBSERVED RESULT *History* is cleared, there is no active element in the Plasma widget. Clipboard's *tooltip* says that "the clipboard is empty". But pressing Ctrl+V pastes the last clipboard content! EXPECTED RESULT Clipboard should actually be cleared. This worked fine in 5.15.x (and maybe also in 5.16.0/5.16.1). SOFTWARE/OS VERSIONS KDE Plasma Version: 5.16.2 KDE Frameworks Version: 5.59.0 Qt Version: 5.12.2 Marking as Major due to possible privacy/security issues while Plasma show misleading messages.
Uncheck "Prevent empty clipboard" in settings
Update: It seems to be X11-wide problem. $ xsel -bc should clean the clipboard, but doesn't. A workaround could be to set the clipboard to an empty string: $ true | xclip -selection clipboard and only then clean the Klipper's history. SOFTWARE/OS VERSIONS OS: Ubuntu 19.04 X.Org: 1.20.4
@Kai Uwe Broulik I had this option unchecked. But after: - checking it - pressing Apply - unchecking it - applying the settings again the issue does no longer occur. Weird. Closing the bug.
With "Prevent empty clipboard" option unchecked Klipper fails to work properly. So the original issue still stands (or this is an entirely new problem with Klipper). Issue when "Prevent empty clipboard" option is unchecked: SUMMARY Content of clipboard is lost after closing application. STEPS TO REPRODUCE 0. Uncheck "Prevent empty clipboard" option in Klipper. 1. Open 2 instances of KWrite (or Kate). 2. Input some text into one KWrite window. 3. Copy this text. 4. Close the window (without saving). 5. Try pasting the text into another KWrite window (it won't work). OBSERVED RESULT Cannot paste text copied a moment ago. Plasma's Klipper widget shows the copied text in the history, but it is not in the clipboard (use `xsel -o` to verify this). EXPECTED RESULT Clipboard should contain the copied text. It should not be emptied after closing application window. SOFTWARE/OS VERSIONS KDE Plasma Version: 5.16.2 KDE Frameworks Version: 5.59.0 Qt Version: 5.12.2
The original issue was most likely caused by this change: https://github.com/KDE/plasma-workspace/commit/3bd6ac34ed74e3b86bfb6b29818b726baf505f20#diff-4aebb4a49ac5fcac58f31c1db689096e >[Klipper] Always restore the last clipbboard item >Summary: >D19852 intrdouced x-kde-force-image-copy hint for programs to specify that >images should be set to the clipboard even if should not be included in the >history. But when the program was closed the clipboard was restored to the first >item in history in which the image was not included. To fix this introduce a new >class member which holds the last clipboard item and restore it. >Credit goes to David Edumndson >Test Plan: >Try it with spectacle It is fine, but simply lacks support for clearing the history for the new m_last variable breaking the previous behavior in this matter.
The original issue still occurs in Plasma 5.16.3.
Fix: https://phabricator.kde.org/D22684
Git commit 423308f854c4b76c72da4e3263614c7b20642ebf by Nate Graham, on behalf of Piotr Henryk Dabrowski. Committed on 16/12/2019 at 22:58. Pushed by ngraham into branch 'master'. [Klipper] Fix clipboard history management Summary: Fixed clearing the clipboard when clearing history (bug #409366 caused by 3bd6ac34ed74e3b86bfb6b29818b726baf505f20) Properly synchronize clipboard content and history (deleting last item in history didn't clear the clipboard). Keep last image in history even if we are ignoring images, but without preview (so that we can still clear history, and the tooltip says truth about clipboard content). Fixed tray icon tooltip text. Do not scale small images up in clipboard Plasmoid. {F7168503} Test Plan: Spectacle -> [Copy to Clipboard] Paste into Dolphin (clipboard content) Deleting single items from clipboard Clearing the entire history Reviewers: #plasma, #plasma_workspaces, ngraham, davidedmundson Reviewed By: #plasma, #plasma_workspaces, ngraham, davidedmundson Subscribers: GB_2, davidre, plasma-devel Tags: #plasma Differential Revision: https://phabricator.kde.org/D22684 M +1 -1 applets/clipboard/contents/ui/ClipboardPage.qml M +2 -1 applets/clipboard/contents/ui/ImageItemDelegate.qml M +2 -0 klipper/autotests/CMakeLists.txt M +23 -7 klipper/historyimageitem.cpp M +1 -1 klipper/historyimageitem.h M +2 -2 klipper/historyitem.cpp M +4 -1 klipper/historyitem.h M +1 -0 klipper/historymodel.cpp M +12 -0 klipper/historymodel.h M +23 -14 klipper/klipper.cpp M +2 -2 klipper/klipper.h https://commits.kde.org/plasma-workspace/423308f854c4b76c72da4e3263614c7b20642ebf