When setting mouse behaviour to double click this setting is NOT written to qt4 configuration file. So some applications wil open with single click. Reproducible: Always Steps to Reproduce: 1.set system settings to double click 2.open libreoffice and have a look to file-open dialog. 3. Workaround: open with any texteditor: ~/.kde4/share/config/kdeglobals replace item SingleClick=true by SingleClick=false that fixes the problen immideately.
Checked in manjaro linux (arch based) 16.08
Sometimes this Parameter in not at all in this file. It is located within the section [KDE]
Fixed in 5.7.4. *** This bug has been marked as a duplicate of bug 367074 ***