Enable MA0029 and fix noncompliance

"Combine LINQ methods"

Common.ruleset

@@ -198,7 +198,7 @@
 		<Rule Id="MA0028" Action="Hidden" />
 
 		<!-- Combine LINQ methods -->
-		<Rule Id="MA0029" Action="Hidden" />
+		<Rule Id="MA0029" Action="Error" />
 
 		<!-- Remove useless OrderBy call -->
 		<Rule Id="MA0030" Action="Error" />

src/BizHawk.Client.EmuHawk/CoreFeatureAnalysis.cs

@@ -153,19 +153,10 @@ namespace BizHawk.Client.EmuHawk
 				ret.Nodes.Add(serviceNode);
 			}
 
-
-			var knownServices = Emulation.Common.ReflectionCache.Types
-				.Where(t => typeof(IEmulatorService).IsAssignableFrom(t))
-				.Where(t => t != typeof(IEmulatorService))
-				.Where(t => t != typeof(ITextStatable)) // Hack for now, eventually we can get rid of this interface in favor of a default implementation
-				.Where(t => t.IsInterface);
-
-			var additionalServices = knownServices
-				.Where(t => !ci.Services.ContainsKey(t.ToString()))
-				.Where(t => !ci.NotApplicableTypes.Contains(t.ToString()))
-				.Where(t => !typeof(ISpecializedEmulatorService).IsAssignableFrom(t)); // We don't want to show these as unimplemented, they aren't expected services
-
-			foreach (Type service in additionalServices)
+			foreach (var service in Emulation.Common.ReflectionCache.Types.Where(t => t.IsInterface
+				&& typeof(IEmulatorService).IsAssignableFrom(t) && !typeof(ISpecializedEmulatorService).IsAssignableFrom(t) // don't show ISpecializedEmulatorService subinterfaces as "missing" as there's no expectation that they'll be implemented eventually
+				&& t != typeof(IEmulatorService) && t != typeof(ITextStatable) // denylisting ITextStatable is a hack for now, eventually we can get merge it into IStatable w/ default interface methods
+				&& !ci.Services.ContainsKey(t.ToString()) && !ci.NotApplicableTypes.Contains(t.ToString())))
 			{
 				string img = "Bad";
 				var serviceNode = new TreeNode

src/BizHawk.Client.EmuHawk/CustomControls/InputRoll/InputRoll.Drawing.cs

@@ -33,8 +33,7 @@ namespace BizHawk.Client.EmuHawk
 				else
 				{
 					visibleColumns = _columns.VisibleColumns
-						.Where(c => c.Right > _hBar.Value)
-						.Where(c => c.Left - _hBar.Value < e.ClipRectangle.Width)
+						.Where(c => c.Right > _hBar.Value && c.Left - _hBar.Value < e.ClipRectangle.Width)
 						.ToList();
 				}
 

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -2070,8 +2070,8 @@ namespace BizHawk.Client.EmuHawk
 		}
 
 		private static readonly IList<Type> SpecializedTools = ReflectionCache.Types
-			.Where(t => typeof(IToolForm).IsAssignableFrom(t) && !t.IsAbstract)
-			.Where(t => t.GetCustomAttribute<SpecializedToolAttribute>() != null)
+			.Where(static t => !t.IsAbstract && typeof(IToolForm).IsAssignableFrom(t)
+				&& t.GetCustomAttribute<SpecializedToolAttribute>() is not null)
 			.ToList();
 
 		private ISet<char> _availableAccelerators;

src/BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.MenuItems.cs

@@ -1218,8 +1218,7 @@ namespace BizHawk.Client.EmuHawk
 			ColumnsSubMenu.DropDownItems.Clear();
 
 			var columns = TasView.AllColumns
-				.Where(c => !string.IsNullOrWhiteSpace(c.Text))
-				.Where(c => c.Name != "FrameColumn")
+				.Where(static c => !string.IsNullOrWhiteSpace(c.Text) && c.Name is not "FrameColumn")
 				.ToList();
 
 			int workingHeight = Screen.FromControl(this).WorkingArea.Height;

src/BizHawk.Client.EmuHawk/tools/ToolBox.cs

@@ -45,11 +45,10 @@ namespace BizHawk.Client.EmuHawk
 			ToolBoxStrip.Items.Clear();
 
 			var tools = EmuHawk.ReflectionCache.Types
-				.Where(t => typeof(IToolForm).IsAssignableFrom(t))
-				.Where(t => typeof(Form).IsAssignableFrom(t))
-				.Where(t => !typeof(ToolBox).IsAssignableFrom(t))
-				.Where(t => ServiceInjector.IsAvailable(Emulator.ServiceProvider, t))
-				.Where(t => VersionInfo.DeveloperBuild || !t.GetCustomAttributes(false).OfType<ToolAttribute>().Any(a => !a.Released));
+				.Where(t => typeof(IToolForm).IsAssignableFrom(t) && typeof(Form).IsAssignableFrom(t)
+					&& !typeof(ToolBox).IsAssignableFrom(t)
+					&& ServiceInjector.IsAvailable(Emulator.ServiceProvider, t)
+					&& (VersionInfo.DeveloperBuild || !t.GetCustomAttributes(false).OfType<ToolAttribute>().Any(static a => !a.Released)));
 
 			/*
 			for (int i = 0; i < tools.Count(); i++)

src/BizHawk.Client.EmuHawk/tools/ToolManager.cs

@@ -490,9 +490,7 @@ namespace BizHawk.Client.EmuHawk
 		}
 
 		public IEnumerable<Type> AvailableTools => EmuHawk.ReflectionCache.Types
-			.Where(t => typeof(IToolForm).IsAssignableFrom(t))
-			.Where(t => !t.IsInterface)
-			.Where(IsAvailable);
+			.Where(t => !t.IsInterface && typeof(IToolForm).IsAssignableFrom(t) && IsAvailable(t));
 
 		/// <summary>
 		/// Calls UpdateValues() on an instance of T, if it exists

src/BizHawk.Client.EmuHawk/tools/Watch/RamWatch.cs

@@ -570,7 +570,7 @@ namespace BizHawk.Client.EmuHawk
 				}
 			}
 
-			ErrorIconButton.Visible = _watches.Where(watch => !watch.IsSeparator).Any(watch => !watch.IsValid);
+			ErrorIconButton.Visible = _watches.Any(static watch => !watch.IsSeparator && !watch.IsValid);
 
 			MessageLabel.Text = message;
 		}

src/BizHawk.Emulation.Common/Base Implementations/BasicServiceProvider.cs

@@ -25,11 +25,8 @@ namespace BizHawk.Emulation.Common
 			// this also fully allows services that are not IEmulatorService
 			Type coreType = core.GetType();
 
-			var services = coreType.GetInterfaces()
-				.Where(t => typeof(IEmulatorService).IsAssignableFrom(t))
-				.Where(t => t != typeof(IEmulatorService) && t != typeof(ISpecializedEmulatorService));
-
-			foreach (Type service in services)
+			foreach (var service in coreType.GetInterfaces().Where(static t => typeof(IEmulatorService).IsAssignableFrom(t)
+				&& t != typeof(IEmulatorService) && t != typeof(ISpecializedEmulatorService)))
 			{
 				_services.Add(service, core);
 			}

src/BizHawk.Emulation.Cores/Waterbox/WaterboxCore.cs

@@ -69,9 +69,7 @@ namespace BizHawk.Emulation.Cores.Waterbox
 					.ToArray();
 
 				var memoryDomains = _memoryAreas.Select(a => WaterboxMemoryDomain.Create(a, _exe)).ToList();
-				var primaryDomain = memoryDomains
-					.Where(md => md.Definition.Flags.HasFlag(LibWaterboxCore.MemoryDomainFlags.Primary))
-					.Single();
+				var primaryDomain = memoryDomains.Single(static md => md.Definition.Flags.HasFlag(LibWaterboxCore.MemoryDomainFlags.Primary));
 
 				var mdl = new MemoryDomainList(
 					memoryDomains.Cast<MemoryDomain>()