updated class diagrams,

added checks before adding something to history,
implemented copying everything when nothing is selected

Common/Common.cd

@@ -16,7 +16,7 @@
     <Position X="9.717" Y="0.5" Height="0.291" Width="2.25" />
   </Comment>
   <Comment CommentText="Context">
-    <Position X="12.158" Y="0.5" Height="0.291" Width="2.25" />
+    <Position X="0.5" Y="4" Height="0.291" Width="2.25" />
   </Comment>
   <Class Name="Common.AppSettings.AppSetting" Collapsed="true">
     <Position X="0.5" Y="2.75" Width="1.5" />
@@ -43,7 +43,7 @@
   <Class Name="Common.Helpers.EnumHelpers" Collapsed="true">
     <Position X="3" Y="1.75" Width="1.5" />
     <TypeIdentifier>
-      <HashCode>AAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAIAAAAA=</HashCode>
+      <HashCode>AAAAAAAAAAAAEAAAAAAAAAAAAAAAEAgAAAAAAIABAAA=</HashCode>
       <FileName>Helpers\EnumHelpers.cs</FileName>
     </TypeIdentifier>
   </Class>
@@ -92,8 +92,16 @@
       <FileName>StartupHelpers\ServiceExtensions.cs</FileName>
     </TypeIdentifier>
   </Class>
+  <Class Name="Common.Helpers.RecurringTimer" Collapsed="true">
+    <Position X="3" Y="2.75" Width="1.5" />
+    <TypeIdentifier>
+      <HashCode>AAAAAAAAACAgAAAAAAAAAAAAAAAAAAAAIAAAAAAAAAA=</HashCode>
+      <FileName>Helpers\RecurringTimer.cs</FileName>
+    </TypeIdentifier>
+    <Lollipop Position="0.2" />
+  </Class>
   <Interface Name="Common.IContext" Collapsed="true">
-    <Position X="12.25" Y="1" Width="2" />
+    <Position X="0.5" Y="4.5" Width="2" />
     <TypeIdentifier>
       <HashCode>AAAAAAAAAACYAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=</HashCode>
       <FileName>IContext.cs</FileName>

MultiTerm.Core/TerminalViewModel.cd

@@ -15,18 +15,25 @@
       </Path>
     </InheritanceLine>
     <TypeIdentifier>
-      <HashCode>AAAAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAACAAAAgA=</HashCode>
+      <HashCode>AAAAAAKAAAAIIAAAAUAAAAAAAAAAAAAAAQAACAAAAgA=</HashCode>
       <FileName>ViewModel\SendReceiveViewModel.cs</FileName>
     </TypeIdentifier>
   </Class>
   <Class Name="MultiTerm.Core.ViewModel.TerminalViewModel" Collapsed="true">
     <Position X="4.75" Y="4.25" Width="4.25" />
     <TypeIdentifier>
-      <HashCode>EAQCUCCAQIAAIgAgEEAGBAgAAAAFRKYAAARgCAAAAAA=</HashCode>
+      <HashCode>EAQAUKIAQIAMAgQgEUAGBAhAAAAFRKYAAQRgCAAAABA=</HashCode>
       <FileName>ViewModel\TerminalViewModel.cs</FileName>
     </TypeIdentifier>
     <Lollipop Position="0.2" />
   </Class>
+  <Class Name="MultiTerm.Core.ViewModel.ConsoleViewModel" Collapsed="true">
+    <Position X="7" Y="5.75" Width="2" />
+    <TypeIdentifier>
+      <HashCode>AgAAAAIgBAAIAgACgUAAggAAAACAAEAAAYAQCAAAiAM=</HashCode>
+      <FileName>ViewModel\ConsoleViewModel.cs</FileName>
+    </TypeIdentifier>
+  </Class>
   <Interface Name="MultiTerm.Core.ViewModel.ITerminalViewModel">
     <Position X="0.5" Y="4" Width="4" />
     <TypeIdentifier>

MultiTerm.Core/ViewModel/MultiFormatDataViewModel.cs

@@ -150,20 +150,32 @@ public partial class MultiFormatDataViewModel : ObservableObject
         }
     }
 
+    /// <summary>
+    /// Returns the selected Data as string in the <paramref name="format"/> given.
+    /// If nothing is selected, returns the whole content of Data.
+    /// </summary>
+    /// <param name="format">format to return data in</param>
+    /// <returns>the data in the given format</returns>
     public string GetSelectedDataAsString(FormatType format)
     {
-        // nothing selected => return empty string
-        if(this.Selected == null || this.Selected.Count == 0) { return string.Empty; }
+        List<ByteDataViewModel>? dataCopy = new();
 
-        // shallow copy of the selected items
-        var selectedCopy = this.Selected.Select(item => (ByteDataViewModel)item.Clone()).ToList();
+        // nothing selected => return whole data
+        if(this.Selected == null || this.Selected.Count == 0) 
+        {
+            dataCopy = this.Data.Select(item => (ByteDataViewModel)item.Clone()).ToList();
+        }
+        else // something is selected: shallow copy of the selected items
+        {
+            dataCopy = this.Selected.Select(item => (ByteDataViewModel)item.Clone()).ToList();
+        }
 
         string dataAsString = string.Empty;
         dataAsString = format switch
         {
-            FormatType.Character => ByteDataViewModelHelpers.GetCharacterStringOfBytesDataViewModels(selectedCopy),
-            FormatType.Hexadecimal => ByteDataViewModelHelpers.GetHexadecimalStringOfBytesDataViewModels(selectedCopy),
-            FormatType.Binary => ByteDataViewModelHelpers.GetBinaryStringOfEBytesDataViewModels(selectedCopy),
+            FormatType.Character => ByteDataViewModelHelpers.GetCharacterStringOfBytesDataViewModels(dataCopy),
+            FormatType.Hexadecimal => ByteDataViewModelHelpers.GetHexadecimalStringOfBytesDataViewModels(dataCopy),
+            FormatType.Binary => ByteDataViewModelHelpers.GetBinaryStringOfEBytesDataViewModels(dataCopy),
             _ => throw new ArgumentException($"'{GetSelectedDataAsString}()' does not have handling implemented for {nameof(FormatType)} {format}")
         };
 

MultiTerm.Core/ViewModel/TerminalViewModel.cs

@@ -345,6 +345,15 @@ public abstract partial class TerminalViewModel : ObservableObject, ITerminalVie
     /// <param name="element">element to add to the history</param>
     protected void AddToSendHistory(IHistoryElement element)
     {
+        // ignore elements that are of zero length
+        if(element.DisplayText.Length <= 0) 
+        { return; }
+
+        // do not insert elements that have the same content as the last element
+        if (this.SentMessagesHistory.Count > 0 &&
+            element.DisplayText.Equals(this.SentMessagesHistory.First().DisplayText)) 
+        { return; }
+
         // shallow copy of element (so that element can be changed externally)
         var copy = (IHistoryElement)element.Clone();