When clicked on widget icon, color picker "cross" appear, but does not pick any colors. However, "right click color picker > open color dialog" seems to work ok.
Is this Qt 5.9 with a multi-screen setup?
Yes! I am sorry for not writing down this. In fact, I am not able to add a widget to the second screen, "add widgets" column appears only on the first one. Thank you for support.
Thanks, I experienced the same after a Qt 5.9 update. Also thanks for the color color dialog hint, I was able to just take its apparently more reliable picking code for the applet. Patch: https://phabricator.kde.org/D6639
Glad I could help! Thank you for support and for patch.
Git commit 0ed491a1b0f1013bfd239ba1dc41210144c23e25 by Kai Uwe Broulik. Committed on 12/07/2017 at 16:11. Pushed by broulik into branch 'Plasma/5.10'. [Color Picker] Fix picking colors in multi-screen Simplifies code and also grab just one pixel instead of the entire screen. FIXED-IN: 5.10.4 Differential Revision: https://phabricator.kde.org/D6639 M +9 -8 applets/colorpicker/plugin/grabwidget.cpp https://commits.kde.org/kdeplasma-addons/0ed491a1b0f1013bfd239ba1dc41210144c23e25