broulik added a comment.
> As a general cross-platform UI convention, Shift+scroll wheel is typically used for horizontal scrolling. Qt does it this way. Alt scrolls horizontally for Qt as you can experience in all KDE widget apps. REPOSITORY R169 Kirigami REVISION DETAIL https://phabricator.kde.org/D8726 To: broulik, #plasma, mart Cc: ngraham, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, davidedmundson, mart, hein