Let the cursor handle be visible regardless of selection

The cursor handle is visible on Android even when there's no selection.
Let the style decide when to show/hide the handles, but make sure to
disable the corresponding MouseArea when a handle is hidden.

Change-Id: I211c122998223ad25279bee2841c5b5e14d4c48e
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

src/controls/Private/TextHandle.qml

@@ -75,7 +75,7 @@ Loader {
     MouseArea {
         id: mouse
         anchors.fill: item
-        enabled: handle.active
+        enabled: item && item.visible
         preventStealing: true
         property real pressX
         property point offset

src/controls/Private/TextInputWithHandles.qml

@@ -170,7 +170,7 @@ TextInput {
         x: mappedPos.x
         y: mappedPos.y
 
-        visible: pressed || (input.hasSelection && handleX + handleWidth >= -1 && handleX <= control.width + 1)
+        visible: pressed || ((input.cursorVisible || input.hasSelection) && handleX + handleWidth >= -1 && handleX <= control.width + 1)
 
         onPositionChanged: {
             if (!input.blockRecursion) {

src/controls/Styles/iOS/CursorHandleStyle.qml

@@ -45,6 +45,7 @@ Item {
     y: -20
     width: 80
     height: knob.height + knobLine.height + 60
+    visible: styleData.hasSelection
 
     Rectangle {
         id: knob

src/controls/TextArea.qml

@@ -933,7 +933,7 @@ ScrollView {
 
                 property var posInViewport: flickableItem.contentX !== flickableItem.contentY !== Number.MAX_VALUE ?
                                                 parent.mapToItem(viewport, handleX, handleY) : -1
-                visible: pressed || (edit.hasSelection
+                visible: pressed || ((edit.cursorVisible || edit.hasSelection)
                                      && posInViewport.y + handleHeight >= -1
                                      && posInViewport.y <= viewport.height + 1
                                      && posInViewport.x + handleWidth >= -1