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Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 5.15.10, 6.2.5, 6.3.1, 6.4.0 Beta1
Affects Version/s: 5.15.2
Component/s: Quick: Controls 2
Labels:
None

Platform/s:

Linux/X11
Commits:
2ae87dcece (qt/qtdeclarative/dev) 2ae87dcece (qt/tqtc-qtdeclarative/dev) 15b03052bc (qt/qtdeclarative/6.3) 15b03052bc (qt/tqtc-qtdeclarative/6.3) c6ad9c30c8 (qt/tqtc-qtquickcontrols2/5.15) 6da4296fac (qt/tqtc-qtdeclarative/6.2)

Displaying the following QtQuick 2 dialog with Material styling on Qt 5.15.2, the DialogButtonBox footer doesn't appear to regenerate it's child button layout on change of child button width, and the widened Button ends up spilling over the RH edge of the Dialog. The same code run on Qt 5.9.8 works as one would expect.

import QtQuick 2.7
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3
import QtQuick.Window 2.2
import QtQuick.Controls.Material 2.2

Dialog {
    id: root

    title: "DialogButtonBox not regenerating child button layout on change of child width"

    height: parent.height*2/5

    width:  parent.width*2/3

    modal: true

    standardButtons: Dialog.Cancel;

    footer: DialogButtonBox {

        delegate: Button{}

        Button {
            text: "Button A"
        }

        Button {
            id: buttonB
            text: "Button B"

            Timer {
                interval: 5000
                repeat: false
                running: true
                onTriggered: {
                    buttonB.implicitWidth = 150
                }
            }
        }
    }
}