Linedef Edit Form, UDMF: a waring is now shown when trying to apply a non-zero action without any activation flags.

Program Configuration: selected test engine index was not saved when applying the form.
Program Configuration: selected test engine index was not pasted when pasting a game configuration or test engines.
Program Configuration: in some cases current test engine name was not saved when applying the form.
Program Configuration: fixed broken logic when trying to add a test engine with the same file name as already existing one.

Source/Core/Config/ConfigurationInfo.cs

@@ -391,6 +391,7 @@ namespace CodeImp.DoomBuilder.Config
 			this.nodebuildersave = ci.nodebuildersave;
 			this.nodebuildertest = ci.nodebuildertest;
 			this.formatinterface = ci.formatinterface; //mxd
+			this.currentEngineIndex = ci.currentEngineIndex; //mxd
 			this.resources = new DataLocationList();
 			this.resources.AddRange(ci.resources);
 			
@@ -472,8 +473,10 @@ namespace CodeImp.DoomBuilder.Config
 		//mxd
 		internal void PasteTestEnginesFrom(ConfigurationInfo source) 
 		{
+			currentEngineIndex = source.currentEngineIndex;
 			testEngines = new List<EngineInfo>();
 			foreach(EngineInfo info in source.testEngines) testEngines.Add(new EngineInfo(info));
+			if(currentEngineIndex >= testEngines.Count) currentEngineIndex = testEngines.Count - 1;
 			changed = true;
 		}
 
@@ -491,12 +494,14 @@ namespace CodeImp.DoomBuilder.Config
 		{
 			nodebuildersave = source.nodebuildersave;
 			nodebuildertest = source.nodebuildertest;
+			currentEngineIndex = source.currentEngineIndex;
 			resources = new DataLocationList();
 			resources.AddRange(source.resources);
 
 			testEngines = new List<EngineInfo>();
 			foreach(EngineInfo info in source.testEngines)
-				testEngines.Add(new EngineInfo(info)); if(currentEngineIndex >= testEngines.Count) currentEngineIndex = testEngines.Count - 1;
+				testEngines.Add(new EngineInfo(info)); 
+			if(currentEngineIndex >= testEngines.Count) currentEngineIndex = testEngines.Count - 1;
 			linedefColorPresets = new LinedefColorPreset[source.linedefColorPresets.Length];
 			for(int i = 0; i < source.linedefColorPresets.Length; i++)
 				linedefColorPresets[i] = new LinedefColorPreset(source.linedefColorPresets[i]);

Source/Core/Windows/ConfigForm.cs

@@ -309,7 +309,7 @@ namespace CodeImp.DoomBuilder.Windows
 			
 			//mxd. Update engine name if needed
 			configinfo.TestEngines[configinfo.CurrentEngineIndex].CheckProgramName(false);
-			cbEngineSelector.Text = configinfo.TestProgramName;
+			cbEngineSelector.Items[cbEngineSelector.SelectedIndex] = configinfo.TestProgramName;
 		}
 
 		// Test parameters changed
@@ -337,11 +337,26 @@ namespace CodeImp.DoomBuilder.Windows
 			}
 		}
 
+		//mxd
+		private void ApplyTestEngineNameChange() 
+		{
+			int index = (int)cbEngineSelector.Tag;
+			if(index != -1 && cbEngineSelector.Text != cbEngineSelector.Items[index].ToString()) {
+				cbEngineSelector.Items[index] = cbEngineSelector.Text;
+				configinfo.TestProgramName = cbEngineSelector.Text;
+				configinfo.Changed = true; //mxd
+			}
+		}
+		
 		// OK clicked
 		private void apply_Click(object sender, EventArgs e)
 		{
 			ConfigurationInfo ci;
 
+			//mxd. Apply changes of current test engine name, if there are any
+			//TODO: move engine selector stuff into separate component!
+			if(configinfo != null) ApplyTestEngineNameChange();
+
 			//mxd. Apply configuration items. They should be in the same order, riiiight?
 			for(int i = 0; i < listconfigs.Items.Count; i++) {
 				// Get configuration item
@@ -389,7 +404,6 @@ namespace CodeImp.DoomBuilder.Windows
 				//mxd. Update engine name
 				configinfo.TestEngines[configinfo.CurrentEngineIndex].CheckProgramName(true);
 				configinfo.Changed = true;
-				cbEngineSelector.Text = configinfo.TestProgramName;
 			}
 		}
 
@@ -725,13 +739,7 @@ namespace CodeImp.DoomBuilder.Windows
 
 		//mxd
 		private void cbEngineSelector_DropDown(object sender, EventArgs e) {
-			int index = (int)cbEngineSelector.Tag;
+			ApplyTestEngineNameChange();
-
-			if(index != -1 && cbEngineSelector.Text != cbEngineSelector.Items[index].ToString()) {
-				cbEngineSelector.Items[index] = cbEngineSelector.Text;
-				configinfo.TestProgramName = cbEngineSelector.Text;
-				configinfo.Changed = true; //mxd
-			}
 		}
 
 		//mxd

Source/Core/Windows/LinedefEditForm.cs

@@ -700,6 +700,24 @@ namespace CodeImp.DoomBuilder.Windows
 				return;
 			}
 
+			// Check if we have at least one activation flag when there's an action in UDMF map format (mxd)
+			if (General.Map.UDMF && !action.Empty) 
+			{
+				bool haveactivationflag = false;
+				foreach (CheckBox c in udmfactivates.Checkboxes) 
+				{
+					if (c.CheckState != CheckState.Unchecked) 
+					{
+						haveactivationflag = true;
+						break;
+					}
+				}
+
+				if (!haveactivationflag && 
+					General.ShowWarningMessage("You are setting an action without any activation flags.\nIs that OK?", MessageBoxButtons.YesNo) == DialogResult.No) 
+					return;
+			}
+
 			//mxd
 			bool hasAcs = !action.Empty && Array.IndexOf(GZBuilder.GZGeneral.ACS_SPECIALS, action.Value) != -1;
 			int lockNum = lockNumber.GetResult(0);