Common control for terrain follow

src/PlanView/TransectStyleComplexItemTerrainFollow.qml

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+import QtQuick                      2.3
+import QtQuick.Controls             1.2
+import QtQuick.Layouts              1.2
+
+import QGroundControl               1.0
+import QGroundControl.ScreenTools   1.0
+import QGroundControl.Controls      1.0
+import QGroundControl.FactSystem    1.0
+import QGroundControl.FactControls  1.0
+
+ColumnLayout {
+    anchors.left:   parent.left
+    anchors.right:  parent.right
+    spacing:        _margin
+    visible:        tabBar.currentIndex === 2
+
+    property var    missionItem
+
+    QGCCheckBox {
+        id:         followsTerrainCheckBox
+        text:       qsTr("Vehicle follows terrain")
+        checked:    missionItem.followTerrain
+        onClicked:  missionItem.followTerrain = checked
+    }
+
+    GridLayout {
+        Layout.fillWidth:   true
+        columnSpacing:      _margin
+        rowSpacing:         _margin
+        columns:            2
+        enabled:            followsTerrainCheckBox.checked
+
+        QGCLabel { text: qsTr("Tolerance") }
+        FactTextField {
+            fact:               missionItem.terrainAdjustTolerance
+            Layout.fillWidth:   true
+        }
+
+        QGCLabel { text: qsTr("Max Climb Rate") }
+        FactTextField {
+            fact:               missionItem.terrainAdjustMaxClimbRate
+            Layout.fillWidth:   true
+        }
+
+        QGCLabel { text: qsTr("Max Descent Rate") }
+        FactTextField {
+            fact:               missionItem.terrainAdjustMaxDescentRate
+            Layout.fillWidth:   true
+        }
+    }
+}