Sometimes, depending on the size of the task manager and how it is filled, the icons-only task manager would fail to show the very last icon (as the space doesn't fit given the icons' sizes). However, after launching an extra application (adding one extra icon), these icons would shrink, and the previously-hidden icon would become visible, along with the new icon. In my case, with a resolution of 1366x768, big icons, and roughly half of the task bar used by other widgets, this problem happens with exactly the 14th icon, which is not visible while the other 13 are, but when adding a 15th icon, the 14th and 15th both become visible.
Configure > Maximum rows > set to 1 *** This bug has been marked as a duplicate of bug 429312 ***
*** Bug 467190 has been marked as a duplicate of this bug. ***
*** Bug 429312 has been marked as a duplicate of this bug. ***
*** Bug 456745 has been marked as a duplicate of this bug. ***
*** Bug 457297 has been marked as a duplicate of this bug. ***
*** Bug 457169 has been marked as a duplicate of this bug. ***
Git commit 03c41ae57620ef539e7bfc19a9191fb93c5ddbd9 by Marco Martin. Committed on 21/09/2023 at 09:48. Pushed by mart into branch 'master'. applets/taskmanager: Use a Grid instead of a Flow It's not possible to ensure that a flow won't attempt to put an item on a new line. This causes more relayouts and the effect of a newly open task flying over from a phantom new line. Related: bug 473420 FIXED-IN: 6.0 M +3 -3 applets/taskmanager/package/contents/ui/TaskList.qml M +2 -2 applets/taskmanager/package/contents/ui/main.qml https://invent.kde.org/plasma/plasma-desktop/-/commit/03c41ae57620ef539e7bfc19a9191fb93c5ddbd9
*** Bug 476308 has been marked as a duplicate of this bug. ***
(In reply to Nate Graham from comment #8) > *** Bug 476308 has been marked as a duplicate of this bug. *** In plasma 6 a bug appears when one has selected a small spacing between icons.
Please open new bug reports to report new issues.