Fix tool do-after return values (#5764)

Content.Server/Doors/Components/ServerDoorComponent.cs

@@ -705,37 +705,32 @@ namespace Content.Server.Doors.Components
                     {
                         Close();
                     }
-                    return true;
                 }
+
+                // regardless of whether this action actually succeeded, it generated a do-after bar. So prevent other
+                // interactions from happening afterwards by returning true.
+                return true;
             }
 
             // for welding doors
-            if (CanWeldShut && _entMan.TryGetComponent(tool.Owner, out WelderComponent? welder) && welder.Lit)
+            if (_beingWelded || !CanWeldShut || !_entMan.TryGetComponent(tool.Owner, out WelderComponent? welder) || !welder.Lit)
-            {
-                if(!_beingWelded)
-                {
-                    _beingWelded = true;
-                    if(await toolSystem.UseTool(eventArgs.Using, eventArgs.User, Owner, 3f, 3f, _weldingQuality, () => CanWeldShut))
-                    {
-                        // just in case
-                        if (!CanWeldShut)
             {
+                // no interaction occurred
                 return false;
             }
             
+            _beingWelded = true;
+
+            // perform a do-after delay
+            var result = await toolSystem.UseTool(eventArgs.Using, eventArgs.User, Owner, 3f, 3f, _weldingQuality, () => CanWeldShut);
+
+            // if successful, toggle the weld-status (while also ensuring that it can still be welded shut after the delay)
+            if (result)
+                IsWeldedShut = CanWeldShut && !IsWeldedShut;
+
             _beingWelded = false;
-                        IsWeldedShut = !IsWeldedShut;
             return true;
         }
-                    _beingWelded = false;
-                }
-            }
-            else
-            {
-                _beingWelded = false;
-            }
-            return false;
-        }
 
         /// <summary>
         ///     Creates the corresponding door electronics board on the door.