diff --git a/src/declarativeimports/plasmacomponents3/Button.qml b/src/declarativeimports/plasmacomponents3/Button.qml
--- a/src/declarativeimports/plasmacomponents3/Button.qml
+++ b/src/declarativeimports/plasmacomponents3/Button.qml
@@ -45,8 +45,12 @@
     contentItem: RowLayout {
         PlasmaCore.IconItem {
             id: icon
-            Layout.fillWidth: true
-            Layout.fillHeight: true
+
+            Layout.fillWidth: control.icon.width <= 0
+            Layout.fillHeight: control.icon.height <= 0
+            Layout.preferredWidth: control.icon.width > 0 ? control.icon.width : units.iconSizes.small
+            Layout.preferredHeight: control.icon.height > 0 ? control.icon.height : units.iconSizes.small
+
             colorGroup: PlasmaCore.Theme.ButtonColorGroup
             visible: source.length > 0
             source: control.icon ? (control.icon.name || control.icon.source) : ""
diff --git a/src/declarativeimports/plasmacomponents3/TabButton.qml b/src/declarativeimports/plasmacomponents3/TabButton.qml
--- a/src/declarativeimports/plasmacomponents3/TabButton.qml
+++ b/src/declarativeimports/plasmacomponents3/TabButton.qml
@@ -44,8 +44,12 @@
         columns: control.display == T.AbstractButton.TextBesideIcon ? 2 : 1
         PlasmaCore.IconItem {
             id: icon
-            Layout.fillWidth: true
-            Layout.fillHeight: true
+
+            Layout.fillWidth: control.icon.width <= 0
+            Layout.fillHeight: control.icon.height <= 0
+            Layout.preferredWidth: control.icon.width > 0 ? control.icon.width : units.iconSizes.smallMedium
+            Layout.preferredHeight: control.icon.height > 0 ? control.icon.height : units.iconSizes.smallMedium
+
             colorGroup: PlasmaCore.Theme.ButtonColorGroup
             visible: source.length > 0
             source: control.icon ? (control.icon.name || control.icon.source) : ""
@@ -58,7 +62,6 @@
             text: control.Kirigami.MnemonicData.richTextLabel
             font: control.font
             opacity: enabled || control.highlighted || control.checked ? 1 : 0.4
-            color: control.activeFocus && !control.down ? theme.highlightedTextColor : theme.buttonTextColor
             horizontalAlignment: Text.AlignHCenter
             verticalAlignment: Text.AlignVCenter
             elide: Text.ElideRight
diff --git a/src/declarativeimports/plasmacomponents3/ToolButton.qml b/src/declarativeimports/plasmacomponents3/ToolButton.qml
--- a/src/declarativeimports/plasmacomponents3/ToolButton.qml
+++ b/src/declarativeimports/plasmacomponents3/ToolButton.qml
@@ -49,8 +49,12 @@
         columns: control.display == T.AbstractButton.TextBesideIcon ? 2 : 1
         PlasmaCore.IconItem {
             id: icon
-            Layout.fillWidth: true
-            Layout.fillHeight: true
+
+            Layout.fillWidth: control.icon.width <= 0
+            Layout.fillHeight: control.icon.height <= 0
+            Layout.preferredWidth: control.icon.width > 0 ? control.icon.width : units.iconSizes.smallMedium
+            Layout.preferredHeight: control.icon.height > 0 ? control.icon.height : units.iconSizes.smallMedium
+
             colorGroup: PlasmaCore.Theme.ButtonColorGroup
             visible: source.length > 0
             source: control.icon ? (control.icon.name || control.icon.source) : ""