Change the setting's type from `QString` to `QStringList` and adjust relevant code. Previous config requires no porting as a single string in the config file is read as the first item in the list.
Summary: inital -> initial Test Plan: none Reviewers: #kwin, zzag Reviewed By: #kwin, zzag Subscribers: kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D28092
Reviewers: meven, crossi, bport, ervin, #kwin Subscribers: iasensio, ognarb, zzag, kwin Tags: #kwin Differential Revision: https://phabricator.kde.org/D27682