fix(cutting-ui): restore canvas after panel layout and clamp splitter

OpenNest/Forms/CuttingInspectionPanel.cs

@@ -169,15 +169,14 @@ internal sealed class CuttingInspectionPanel : UserControl
         {
             view.InspectionCloseRequested = null;
             if (ReferenceEquals(view.Plate, plate))
-            {
-                view.RestoreViewport(viewport);
                 view.OverlapDisplay = overlapDisplay;
-            }
         }
         var ownedScope = scope;
         ownedScope?.Dispose();
         scope = null;
         editor.FinishCuttingInspection(this);
+        if (!view.IsDisposed && ReferenceEquals(view.Plate, plate))
+            view.RestoreViewport(viewport);
         ownedScope?.ResumeHostClose();
         Dispose();
     }

OpenNest/Forms/EditNestForm.cs

@@ -325,7 +325,10 @@ namespace OpenNest.Forms
             content.Dock = DockStyle.Fill;
             sidePanel.Controls.Add(content);
             sidePanelTitle.Text = title;
-            viewSplitContainer.SplitterDistance = viewSplitContainer.Width - width;
+            var widest = System.Math.Max(viewSplitContainer.Panel1MinSize,
+                viewSplitContainer.Width - viewSplitContainer.Panel2MinSize - viewSplitContainer.SplitterWidth);
+            viewSplitContainer.SplitterDistance = System.Math.Clamp(viewSplitContainer.Width - width,
+                viewSplitContainer.Panel1MinSize, widest);
             viewSplitContainer.Panel2Collapsed = false;
         }