Update debugger to https://github.com/mono/mono/commit/1a6e64a9381c61

src/Components/WebAssembly/DebugProxy/src/MonoDebugProxy/ws-proxy/DebugStore.cs

@@ -32,8 +32,8 @@ internal class BreakpointRequest {
 		public override string ToString ()
 			=> $"BreakpointRequest Assembly: {Assembly} File: {File} Line: {Line} Column: {Column}";
 
-		public object AsSetBreakpointByUrlResponse ()
-			=> new { breakpointId = Id, locations = Locations.Select(l => l.Location.AsLocation ()) };
+		public object AsSetBreakpointByUrlResponse (IEnumerable<object> jsloc)
+			=> new { breakpointId = Id, locations = Locations.Select(l => l.Location.AsLocation ()).Concat (jsloc) };
 
 		public BreakpointRequest () {
 		}
@@ -171,6 +171,28 @@ public static SourceLocation Parse (JObject obj)
 			return new SourceLocation (id, line.Value, column.Value);
 		}
 
+
+		internal class LocationComparer : EqualityComparer<SourceLocation>
+		{
+			public override bool Equals (SourceLocation l1, SourceLocation l2)
+			{
+				if (l1 == null && l2 == null)
+						return true;
+				else if (l1 == null || l2 == null)
+						return false;
+
+				return (l1.Line == l2.Line &&
+						l1.Column == l2.Column &&
+						l1.Id == l2.Id);
+			}
+
+			public override int GetHashCode (SourceLocation loc)
+			{
+				int hCode = loc.Line ^ loc.Column;
+				return loc.Id.GetHashCode () ^ hCode.GetHashCode ();
+			}
+		}
+
 		internal object AsLocation ()
 			=> new {
 				scriptId = id.ToString (),

src/Components/WebAssembly/DebugProxy/src/MonoDebugProxy/ws-proxy/MonoProxy.cs

@@ -184,6 +184,7 @@ protected override async Task<bool> AcceptCommand (MessageId id, string method,
 					}
 
 					var bpid = resp.Value["breakpointId"]?.ToString ();
+					var locations = resp.Value["locations"]?.Values<object>();
 					var request = BreakpointRequest.Parse (bpid, args);
 					context.BreakpointRequests[bpid] = request;
 					if (await IsRuntimeAlreadyReadyAlready (id, token)) {
@@ -193,7 +194,8 @@ protected override async Task<bool> AcceptCommand (MessageId id, string method,
 						await SetBreakpoint (id, store, request, token);
 					}
 
-					SendResponse (id, Result.OkFromObject (request.AsSetBreakpointByUrlResponse()), token);
+					var result = Result.OkFromObject (request.AsSetBreakpointByUrlResponse (locations));
+					SendResponse (id, result, token);
 					return true;
 				}
 
@@ -765,17 +767,21 @@ async Task SetBreakpoint (SessionId sessionId, DebugStore store, BreakpointReque
 				return;
 			}
 
-			var locations = store.FindBreakpointLocations (req).ToList ();
+			var comparer = new SourceLocation.LocationComparer ();
+			// if column is specified the frontend wants the exact matches
+			// and will clear the bp if it isn't close enoug
+			var locations = store.FindBreakpointLocations (req)
+				.Distinct (comparer)
+				.Where (l => l.Line == req.Line && (req.Column == 0 || l.Column == req.Column))
+				.OrderBy (l => l.Column)
+				.GroupBy (l => l.Id);
+
 			logger.LogDebug ("BP request for '{req}' runtime ready {context.RuntimeReady}", req, GetContext (sessionId).IsRuntimeReady);
 
 			var breakpoints = new List<Breakpoint> ();
 
-			// if column is specified the frontend wants the exact matches
-			// and will clear the bp if it isn't close enough
-			if (req.Column != 0)
-				locations = locations.Where (l => l.Column == req.Column).ToList ();
-
-			foreach (var loc in locations) {
+			foreach (var sourceId in locations) {
+				var loc = sourceId.First ();
 				var bp = await SetMonoBreakpoint (sessionId, req.Id, loc, token);
 
 				// If we didn't successfully enable the breakpoint