Change exception type to ArgumentOutOfRangeException and shorten error message

Co-authored-by: brianrob <[email protected]>

Author: Copilot

src/PerfView.Tests/StackViewer/StackWindowTests.cs

@@ -874,8 +874,8 @@ public void TestExportFlameGraphWithInvalidCanvasSize()
             var tempFile = Path.GetTempFileName();
             try
             {
-                // Attempt to export should throw InvalidOperationException with a meaningful message
-                var exception = Assert.Throws<InvalidOperationException>(() =>
+                // Attempt to export should throw ArgumentOutOfRangeException with a meaningful message
+                var exception = Assert.Throws<ArgumentOutOfRangeException>(() =>
                 {
                     FlameGraph.Export(canvas, tempFile);
                 });

src/PerfView/StackViewer/FlameGraph.cs

@@ -89,9 +89,9 @@ public static void Export(Canvas flameGraphCanvas, string filePath)
             // Validate that the canvas has a valid size before attempting to export
             if (width <= 0 || height <= 0)
             {
-                throw new InvalidOperationException(
-                    $"Cannot export flame graph: the canvas has an invalid size (width={width}, height={height}). " +
-                    "Please ensure the flame graph is visible and has been rendered before attempting to export.");
+                throw new ArgumentOutOfRangeException(
+                    "flameGraphCanvas",
+                    $"Canvas has an invalid size (width={width}, height={height}). Please ensure the flame graph is visible and has been rendered before attempting to export.");
             }
 
             var renderTargetBitmap = new RenderTargetBitmap(width, height, 96d, 96d, PixelFormats.Default);

src/PerfView/StackViewer/StackWindow.xaml.cs

@@ -2772,7 +2772,7 @@ private void DoSaveFlameGraph(object sender, RoutedEventArgs e)
                     FlameGraph.Export(FlameGraphCanvas, saveDialog.FileName);
                     StatusBar.Log($"Saved flame graph to {saveDialog.FileName}");
                 }
-                catch (InvalidOperationException ex)
+                catch (ArgumentOutOfRangeException ex)
                 {
                     StatusBar.LogError($"Failed to save flame graph: {ex.Message}");
                 }