fix #986,option to not group tasks

--give the user option to group or not
tasks of the same application by default

containment/package/contents/config/main.xml

@@ -231,6 +231,10 @@
       <default>false</default>
       <label>show only windows that there is a launcher for them</label>
     </entry>
+    <entry name="groupTasksByDefault" type="Bool">
+      <default>true</default>
+      <label>by default group same tasks</label>
+    </entry>
     <entry name="showOnlyCurrentScreen" type="Bool">
       <default>false</default>
     </entry>

containment/package/contents/ui/main.qml

@@ -316,6 +316,7 @@ DragDrop.DropArea {
     //shadows for applets, it should be removed as the appleitems dont need it any more
     property bool enableShadows: plasmoid.configuration.shadows || root.forceTransparentPanel
     property bool dockIsHidden: dock ? dock.visibility.isHidden : true
+    property bool groupTasksByDefault: plasmoid.configuration.groupTasksByDefault
     property bool dotsOnActive: plasmoid.configuration.dotsOnActive
     property bool highlightWindows: plasmoid.configuration.highlightWindows
     property bool reverseLinesPosition: !latteApplet && plasmoid.configuration.panelSize===100 ?

plasmoid/package/contents/ui/main.qml

@@ -171,6 +171,7 @@ Item {
     property bool disableLeftSpacer: false
     property bool disableRightSpacer: false
     property bool dockIsHidden: latteDock ? latteDock.dockIsHidden : false
+    property bool groupTasksByDefault: latteDock ? latteDock.groupTasksByDefault: true
     property bool highlightWindows: latteDock ? latteDock.highlightWindows: plasmoid.configuration.highlightWindows
     property bool indicateAudioStreams: latteDock ? latteDock.indicateAudioStreams : plasmoid.configuration.indicateAudioStreams
     property bool mouseWheelActions: latteDock ? latteDock.mouseWheelActions : true
@@ -634,7 +635,7 @@ Item {
         separateLaunchers: true
         groupInline: false
 
-        groupMode: TaskManager.TasksModel.GroupApplications
+        groupMode: groupTasksByDefault ? TaskManager.TasksModel.GroupApplications : TaskManager.TasksModel.GroupDisabled
         sortMode: TaskManager.TasksModel.SortManual
 
         function updateLaunchersList(){

shell/package/contents/configuration/TasksConfig.qml

@@ -155,6 +155,19 @@ PlasmaComponents.Page {
                 }
             }
 
+            PlasmaComponents.CheckBox {
+                id: groupTasksChk
+                Layout.leftMargin: units.smallSpacing * 2
+                text: i18n("Group tasks of the same application")
+                checked: plasmoid.configuration.groupTasksByDefault
+                tooltip: i18n("By default group tasks of the same application")
+                visible: plasmoid.configuration.advanced
+
+                onClicked: {
+                    plasmoid.configuration.groupTasksByDefault = checked
+                }
+            }
+
             PlasmaComponents.CheckBox {
                 id: mouseWheelChk
                 Layout.leftMargin: units.smallSpacing * 2