hpereiradacosta added a comment.
> Also I tested it now with the Oxygen and United themes, and `QToolButton` has still the same flat frame line in highlight color around it in when hovered like in Breeze, so it seems to be independent of the theme in `QToolButton` as well. In the Oxygen case it is though different looking in the pressed and checked state. Here it has a "depth" effect to it (or it's only the frame line getting bigger). Not sure how we can replicate that. Speaking for the widgets only (QToolButton), the fact that mouse-over looks similar (and, if you look closely, not identical in fact) is just a coincidence. This is handled by the widget style and is not hard coded Check with fusion style for instance (namely: dolphin -style fusion) for the QML side of things I have no idea. REPOSITORY R242 Plasma Framework (Library) REVISION DETAIL https://phabricator.kde.org/D4797 EMAIL PREFERENCES https://phabricator.kde.org/settings/panel/emailpreferences/ To: subdiff, #plasma Cc: ltoscano, broulik, hpereiradacosta, plasma-devel, #frameworks, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol