Merge pull request #46 from giard-alexandre/feat/backport-tdg-master

feat: ports tdg upstream changes

Author: giard-alexandre

src/DynamicTreeDataGrid/DynamicFlatTreeDataGridSource.cs

@@ -163,7 +163,11 @@ public bool SortBy(IColumn? column, ListSortDirection direction) {
 
     public IRows Rows => _rows ??= CreateRows();
 
-    public IEnumerable<TModel> Items => _items;
+    public IEnumerable<TModel> Items {
+        get => _items;
+        set => throw new NotImplementedException(
+            "Set is currently not implemented. Change the passed in ChangeSet instead.");
+    }
 
     public ITreeDataGridSelection? Selection {
         get {

src/DynamicTreeDataGrid/Models/Columns/DynamicColumnListBase.cs

@@ -17,12 +17,14 @@ namespace DynamicTreeDataGrid.Models.Columns;
 /// </remarks>
 public class DynamicColumnListBase<TModel> : NotifyingListBase<IDynamicColumn<TModel>>, IDynamicColumnsBase {
     private readonly HashSet<string> _nameSet = [];
+    private bool _initialized;
     private double _viewportWidth;
 
     public event EventHandler? LayoutInvalidated;
 
     public Size CellMeasured(int columnIndex, int rowIndex, Size size) {
         var column = (IUpdateColumnLayout)this[columnIndex];
+        _initialized = true;
         return new Size(column.CellMeasured(size.Width, rowIndex), size.Height);
     }
 
@@ -94,7 +96,8 @@ public void SetColumnWidth(int columnIndex, GridLength width) {
     public void ViewportChanged(Rect viewport) {
         if (_viewportWidth != viewport.Width) {
             _viewportWidth = viewport.Width;
-            UpdateColumnSizes();
+            if (_initialized)
+                UpdateColumnSizes();
         }
     }