The unnormal block with color stays forever on the desktop and on top of other applications. It is responsive to the new color selection. Another such square appears on the left of the color palette in the moment of selecting colors and then disappears as usual.
Could you please specify the order of steps necessary to create this bug? I was not able to recreate this bug on Ubuntu 18.04. Does it happen every time you use the color picker? Is the window full screened or windowed? Also, which derivative of Ubuntu do you have installed? (Kubuntu? Ubuntu Mate? Regular Ubuntu?)
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information as soon as possible and set the bug status as REPORTED. Due to regular bug tracker maintenance, if the bug is still in NEEDSINFO status with no change in 30 days, the bug will be closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging If you have already provided the requested information, please set the bug status as REPORTED so that the KDE team knows that the bug is ready to be confirmed. Thank you for helping us make KDE software even better for everyone!
Dear Bug Submitter, This bug has been in NEEDSINFO status with no change for at least 30 days. The bug is now closed as RESOLVED > WORKSFORME due to lack of needed information. For more information about our bug triaging procedures please read the wiki located here: https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging Thank you for helping us make KDE software even better for everyone!