Added switch to enable/disable decompiling of expression trees.

ILSpy/Options/DecompilerSettingsPanel.xaml

@@ -7,6 +7,7 @@
 		<CheckBox IsChecked="{Binding YieldReturn}">Decompile enumerators (yield return)</CheckBox>
 		<CheckBox IsChecked="{Binding AsyncAwait}">Decompile async methods (async/await)</CheckBox>
 		<CheckBox IsChecked="{Binding QueryExpressions}" IsEnabled="{Binding AnonymousMethods}">Decompile query expressions</CheckBox>
+		<CheckBox IsChecked="{Binding ExpressionTrees}">Decompile expression trees</CheckBox>
 		<CheckBox IsChecked="{Binding UseDebugSymbols}">Use variable names from debug symbols, if available</CheckBox>
 		<CheckBox IsChecked="{Binding ShowXmlDocumentation}">Show XML documentation in decompiled code</CheckBox>
 		<CheckBox IsChecked="{Binding FoldBraces}">Enable folding on all blocks in braces</CheckBox>

ILSpy/Options/DecompilerSettingsPanel.xaml.cs

@@ -55,6 +55,7 @@ namespace ICSharpCode.ILSpy.Options
 			s.YieldReturn = (bool?)e.Attribute("yieldReturn") ?? s.YieldReturn;
 			s.AsyncAwait = (bool?)e.Attribute("asyncAwait") ?? s.AsyncAwait;
 			s.QueryExpressions = (bool?)e.Attribute("queryExpressions") ?? s.QueryExpressions;
+			s.ExpressionTrees = (bool?)e.Attribute("expressionTrees") ?? s.ExpressionTrees;
 			s.UseDebugSymbols = (bool?)e.Attribute("useDebugSymbols") ?? s.UseDebugSymbols;
 			s.ShowXmlDocumentation = (bool?)e.Attribute("xmlDoc") ?? s.ShowXmlDocumentation;
 			s.FoldBraces = (bool?)e.Attribute("foldBraces") ?? s.FoldBraces;
@@ -69,6 +70,7 @@ namespace ICSharpCode.ILSpy.Options
 			section.SetAttributeValue("yieldReturn", s.YieldReturn);
 			section.SetAttributeValue("asyncAwait", s.AsyncAwait);
 			section.SetAttributeValue("queryExpressions", s.QueryExpressions);
+			section.SetAttributeValue("expressionTrees", s.ExpressionTrees);
 			section.SetAttributeValue("useDebugSymbols", s.UseDebugSymbols);
 			section.SetAttributeValue("xmlDoc", s.ShowXmlDocumentation);
 			section.SetAttributeValue("foldBraces", s.FoldBraces);