QmlDesigner: Fix binding editor empty expression

If the user pressed "Accept" on the binding editor if the text was empty
a dialog with a warning popped up. This fix avoids sending empty strings
to backend when condition.

Task-number: QDS-7729
Change-Id: I77e5e9d34f8566dc4ed215c839b01186d839a2df
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qmldesigner/newstateseditor/Main.qml

@@ -807,10 +807,6 @@ Rectangle {
                                     onStateNameFinished: statesEditorModel.renameState(
                                                              delegateRoot.internalNodeId,
                                                              stateThumbnail.stateName)
-
-                                    onWhenConditionFinished: statesEditorModel.setWhenCondition(
-                                                                 delegateRoot.internalNodeId,
-                                                                 stateThumbnail.whenCondition)
                                 }
                             }
                         }

share/qtcreator/qmldesigner/newstateseditor/StateThumbnail.qml

@@ -65,7 +65,6 @@ Item {
     signal extend
     signal remove
     signal stateNameFinished
-    signal whenConditionFinished
 
     signal grabbing
     signal letGo
@@ -608,8 +607,16 @@ Item {
                     running: false
                     interval: 50
                     repeat: false
-                    onTriggered: statesEditorModel.setWhenCondition(root.internalNodeId,
-                                                                    bindingEditor.newWhenCondition)
+                    onTriggered: {
+                        if (whenCondition.previousCondition === bindingEditor.newWhenCondition)
+                            return
+
+                        if ( bindingEditor.newWhenCondition !== "")
+                            statesEditorModel.setWhenCondition(root.internalNodeId,
+                                                               bindingEditor.newWhenCondition)
+                        else
+                            statesEditorModel.resetWhenCondition(root.internalNodeId)
+                    }
                 }
 
                 stateModelNodeProperty: statesEditorModel.stateModelNode(root.internalNodeId)
@@ -635,6 +642,8 @@ Item {
                 indicatorVisible: true
                 indicator.icon.text: StudioTheme.Constants.edit
                 indicator.onClicked: {
+                    whenCondition.previousCondition = whenCondition.text
+
                     bindingEditor.showWidget()
                     bindingEditor.text = whenCondition.text
                     bindingEditor.prepareBindings()
@@ -662,7 +671,7 @@ Item {
                     whenCondition.previousCondition = whenCondition.text
 
                     if (whenCondition.text !== "")
-                        root.whenConditionFinished()
+                        statesEditorModel.setWhenCondition(root.internalNodeId, root.whenCondition)
                     else
                         statesEditorModel.resetWhenCondition(root.internalNodeId)
 

share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/StudioControls/TextField.qml

@@ -99,7 +99,9 @@ T.TextField {
     }
 
     onActiveFocusChanged: {
-        if (root.activeFocus)
+        // OtherFocusReason in this case means, if the TextField gets focus after the context menu
+        // was closed due to an menu item click.
+        if (root.activeFocus && root.focusReason !== Qt.OtherFocusReason)
             root.preFocusText = root.text
     }