qml: add doAccept and doReject functions to ElDialog.

These functions make sure no duplicate accepted/rejected signals are emitted.

electrum/gui/qml/components/ImportAddressesKeysDialog.qml

@@ -104,7 +104,7 @@ ElDialog {
             Layout.fillWidth: true
             text: qsTr('Import')
             enabled: valid
-            onClicked: accept()
+            onClicked: doAccept()
         }
     }
 

electrum/gui/qml/components/ImportChannelBackupDialog.qml

@@ -23,6 +23,10 @@ ElDialog {
         return valid = Daemon.currentWallet.isValidChannelBackup(text)
     }
 
+    onAccepted: {
+        Daemon.currentWallet.importChannelBackup(channelbackup_ta.text)
+    }
+
     ColumnLayout {
         anchors.fill: parent
         spacing: 0
@@ -84,10 +88,7 @@ ElDialog {
             Layout.fillWidth: true
             enabled: valid
             text: qsTr('Import')
-            onClicked: {
+            onClicked: doAccept()
-                Daemon.currentWallet.importChannelBackup(channelbackup_ta.text)
-                root.accept()
-            }
         }
     }
 

electrum/gui/qml/components/MessageDialog.qml

@@ -47,7 +47,7 @@ ElDialog {
                 text: qsTr('Ok')
                 icon.source: Qt.resolvedUrl('../../icons/confirmed.png')
                 visible: !yesno
-                onClicked: accept()
+                onClicked: doAccept()
             }
 
             FlatButton {
@@ -57,7 +57,7 @@ ElDialog {
                 text: qsTr('Yes')
                 icon.source: Qt.resolvedUrl('../../icons/confirmed.png')
                 visible: yesno
-                onClicked: accept()
+                onClicked: doAccept()
             }
             FlatButton {
                 Layout.fillWidth: true
@@ -66,7 +66,7 @@ ElDialog {
                 text: qsTr('No')
                 icon.source: Qt.resolvedUrl('../../icons/closebutton.png')
                 visible: yesno
-                onClicked: reject()
+                onClicked: doReject()
             }
         }
     }

electrum/gui/qml/components/PasswordDialog.qml

@@ -73,7 +73,7 @@ ElDialog {
             enabled: confirmPassword ? pw_1.text.length >= 6 && pw_1.text == pw_2.text : true
             onClicked: {
                 password = pw_1.text
-                passworddialog.accept()
+                passworddialog.doAccept()
             }
         }
     }

electrum/gui/qml/components/ReceiveDetailsDialog.qml

@@ -97,7 +97,7 @@ ElDialog {
             Layout.fillWidth: true
             text: qsTr('Create request')
             icon.source: '../../icons/confirmed.png'
-            onClicked: accept()
+            onClicked: doAccept()
         }
     }
 

electrum/gui/qml/components/controls/ElDialog.qml

@@ -9,8 +9,27 @@ Dialog {
     property string iconSource
     property bool resizeWithKeyboard: true
 
+    property bool _result: false
+
+    // called to finally close dialog after checks by onClosing handler in main.qml
     function doClose() {
-        close()
+        doReject()
+    }
+
+    // avoid potential multiple signals, only emit once
+    function doAccept() {
+        if (_result)
+            return
+        _result = true
+        accept()
+    }
+
+    // avoid potential multiple signals, only emit once
+    function doReject() {
+        if (_result)
+            return
+        _result = true
+        reject()
     }
 
     parent: resizeWithKeyboard ? Overlay.overlay.children[0] : Overlay.overlay

electrum/gui/qml/components/wizard/Wizard.qml

@@ -131,7 +131,7 @@ ElDialog {
             function finish() {
                 currentItem.accept()
                 _setWizardData(pages.contentChildren[currentIndex].wizard_data)
-                wizard.accept()
+                wizard.doAccept()
             }
 
             property bool pagevalid: false
@@ -163,7 +163,7 @@ ElDialog {
                     Layout.preferredWidth: 1
                     visible: pages.currentIndex == 0
                     text: qsTr("Cancel")
-                    onClicked: wizard.reject()
+                    onClicked: wizard.doReject()
                 }
                 FlatButton {
                     Layout.fillWidth: true