fix to update contents correctly between sessions

--when changing Single mode to Multiple mode the latest
changes from user didnt get into because the kde cache
from KFileConfigPtr hadnt been updated yet. This
patch fixes this by using a temp file that contains
the layout in question.

app/layout.cpp

@@ -1128,16 +1128,29 @@ void Layout::importToCorona()
     //! Settting mutable for create a containment
     m_corona->setImmutability(Plasma::Types::Mutable);
 
-    QString temp1File = QDir::homePath() + "/.config/lattedock.copy1.bak";
+    QString temp1FilePath = QDir::homePath() + "/.config/lattedock.copy1.bak";
+    //! we need to copy first the layout file because the kde cache
+    //! may not have yet been updated (KSharedConfigPtr)
+    //! this way we make sure at the latest changes stored in the layout file
+    //! will be also available when changing to Myltiple Layouts
+    QString tempLayoutFilePath = QDir::homePath() + "/.config/lattedock.layout.bak";
 
     //! WE NEED A WAY TO COPY A CONTAINMENT!!!!
-    QFile copyFile(temp1File);
+    QFile tempLayoutFile(tempLayoutFilePath);
+    QFile copyFile(temp1FilePath);
+    QFile layoutOriginalFile(m_layoutFile);
+
+    if (tempLayoutFile.exists()) {
+        tempLayoutFile.remove();
+    }
 
     if (copyFile.exists())
         copyFile.remove();
 
-    KSharedConfigPtr filePtr = KSharedConfig::openConfig(m_layoutFile);
-    KSharedConfigPtr newFile = KSharedConfig::openConfig(temp1File);
+    layoutOriginalFile.copy(tempLayoutFilePath);
+
+    KSharedConfigPtr filePtr = KSharedConfig::openConfig(tempLayoutFilePath);
+    KSharedConfigPtr newFile = KSharedConfig::openConfig(temp1FilePath);
     KConfigGroup copyGroup = KConfigGroup(newFile, "Containments");
     KConfigGroup current_containments = KConfigGroup(filePtr, "Containments");
 
@@ -1146,7 +1159,7 @@ void Layout::importToCorona()
     copyGroup.sync();
 
     //! update ids to unique ones
-    QString temp2File = newUniqueIdsLayoutFromFile(temp1File);
+    QString temp2File = newUniqueIdsLayoutFromFile(temp1FilePath);
 
 
     //! Finally import the configuration