qml: set a minimum button size

electrum/gui/qml/components/GenericShareDialog.qml

@@ -76,6 +76,7 @@ ElDialog {
                 Layout.alignment: Qt.AlignHCenter
 
                 FlatButton {
+                    Layout.minimumWidth: dialog.width * 1/4
                     text: qsTr('Copy')
                     icon.source: '../../icons/copy_bw.png'
                     onClicked: {
@@ -84,6 +85,7 @@ ElDialog {
                     }
                 }
                 FlatButton {
+                    Layout.minimumWidth: dialog.width * 1/4
                     text: qsTr('Share')
                     icon.source: '../../icons/share.png'
                     onClicked: {

electrum/gui/qml/components/ReceiveDialog.qml

@@ -245,6 +245,7 @@ ElDialog {
                     id: buttons
                     Layout.alignment: Qt.AlignHCenter
                     FlatButton {
+                        Layout.minimumWidth: dialog.width * 1/4
                         icon.source: '../../icons/copy_bw.png'
                         icon.color: 'transparent'
                         text: 'Copy'
@@ -259,6 +260,7 @@ ElDialog {
                         }
                     }
                     FlatButton {
+                        Layout.minimumWidth: dialog.width * 1/4
                         icon.source: '../../icons/share.png'
                         text: 'Share'
                         onClicked: {
@@ -274,6 +276,7 @@ ElDialog {
                         }
                     }
                     FlatButton {
+                        Layout.minimumWidth: dialog.width * 1/4
                         Layout.alignment: Qt.AlignHCenter
                         icon.source: '../../icons/pen.png'
                         text: qsTr('Edit')