projection: begin the exact-path public epoch

The public tree and its history contain only the listed paths. Earlier projection history remains preserved internally.

Source-Sha: 913fde029b935671833254797f0f20f1eb9fabba

Policy-Sha: 913fde029b935671833254797f0f20f1eb9fabba

Tree-Digest: 180ae530c1058a2a5c89837bdce2d323ae83e669e38590ca72e75b8d92b7262f

desktop/qml/AppButton.qml

@@ -0,0 +1,36 @@
+import QtQuick
+import QtQuick.Controls.Basic
+
+Button {
+    id: control
+
+    implicitHeight: Math.max(36, contentItem.implicitHeight + 16)
+    implicitWidth: contentItem.implicitWidth + 28
+    leftPadding: 14
+    rightPadding: 14
+    topPadding: 8
+    bottomPadding: 8
+    font.pixelSize: Theme.fontBody
+
+    background: Rectangle {
+        radius: Theme.radiusSm
+        color: control.down ? Theme.hover : control.hovered ? Theme.hover : Theme.raised
+        border.width: 1
+        border.color: control.activeFocus ? Theme.blue : Theme.bevelDark
+        opacity: control.enabled ? 1 : 0.5
+        Rectangle {
+            anchors { left: parent.left; right: parent.right; top: parent.top; margins: 1 }
+            height: 1
+            color: control.down ? Theme.bevelDark : Theme.bevelLight
+        }
+    }
+
+    contentItem: Text {
+        text: control.text
+        font: control.font
+        color: control.enabled ? Theme.text : Theme.faint
+        horizontalAlignment: Text.AlignHCenter
+        verticalAlignment: Text.AlignVCenter
+    }
+
+}