Add "clear midtextures" action

Source/Plugins/BuilderModes/ClassicModes/LinedefsMode.cs

@@ -1723,6 +1723,51 @@ namespace CodeImp.DoomBuilder.BuilderModes
 			}
 		}
 
+		[BeginAction("clearmidtextures")]
+		public void ClearMidtextures()
+		{
+			// Make list of selected linedefs
+			ICollection<Linedef> selected = General.Map.Map.GetSelectedLinedefs(true);
+			if ((selected.Count == 0) && (highlighted != null) && !highlighted.IsDisposed) selected.Add(highlighted);
+
+			// Anything to do?
+			if (selected.Count > 0)
+			{
+				// Make undo
+				if (selected.Count > 1)
+				{
+					General.Map.UndoRedo.CreateUndo("Cleared midtextures of " + selected.Count + " linedefs");
+					General.Interface.DisplayStatus(StatusType.Action, "Cleared midtextures of " + selected.Count + " linedefs.");
+				}
+				else
+				{
+					General.Map.UndoRedo.CreateUndo("Cleared midtextures of 1 linedef");
+					General.Interface.DisplayStatus(StatusType.Action, "Cleared midtextures of 1 linedef.");
+				}
+
+				foreach (Linedef l in selected)
+				{
+					l.SetFlag(General.Map.Config.PegMidtextureFlag, false);
+					l.Front.SetTextureMid("-");
+					l.Back.SetTextureMid("-");
+				}
+
+				// Update cache values
+				General.Map.IsChanged = true;
+				General.Map.Map.Update();
+
+				// Invoke a new mousemove so that the highlighted item updates
+				MouseEventArgs e = new MouseEventArgs(MouseButtons.None, 0, (int)mousepos.x, (int)mousepos.y, 0);
+				OnMouseMove(e);
+
+				// Redraw screen
+				UpdateSelectionInfo(); //mxd
+				General.Interface.RefreshInfo();
+				General.Map.Renderer2D.UpdateExtraFloorFlag(); //mxd
+				General.Interface.RedrawDisplay();
+			}
+		}
+
 		[BeginAction("splitlinedefs")]
 		public void SplitLinedefs()
 		{

Source/Plugins/BuilderModes/Resources/Actions.cfg

@@ -356,7 +356,7 @@ resetactionsandtags
 {
 	title = "Reset actions and tags";
 	category = "classic";
-	description = "This resets the actions, effects and tags of all lines or sectors in your selection.";
+	description = "This resets the actions, effects and tags of all lines/sectors/things in your selection.";
 	allowkeys = true;
 	allowmouse = true;
 	allowscroll = true;
@@ -374,6 +374,17 @@ resetflags
 	default = 327762;
 }
 
+clearmidtextures
+{
+	title = "Clear midtextures";
+	category = "classic";
+	description = "This removes all midtextures from the selected lines, and removes their Peg Midtexture flag.";
+	allowkeys = true;
+	allowmouse = true;
+	allowscroll = true;
+	default = 327762;
+}
+
 selectnonessential
 {
 	title = "Select non-essential vertices/lines";

Source/Plugins/BuilderModes/VisualModes/BaseVisualMode.cs

@@ -3934,6 +3934,50 @@ namespace CodeImp.DoomBuilder.BuilderModes
 				selection2.Count + (selection2.Count == 1 ? " thing." : " things."));
 		}
 
+		[BeginAction("clearmidtextures")]
+		public void ClearMidtextures()
+		{
+			// Make list of selected linedefs
+			List<VisualGeometry> selection = GetSelectedSurfaces();
+
+			// Anything to do?
+			if (selection.Count > 0)
+			{
+				// Make undo
+				if (selection.Count > 1)
+				{
+					General.Map.UndoRedo.CreateUndo("Cleared midtextures of " + selection.Count + " linedefs");
+					General.Interface.DisplayStatus(StatusType.Action, "Cleared midtextures of " + selection.Count + " linedefs.");
+				}
+				else
+				{
+					General.Map.UndoRedo.CreateUndo("Cleared midtextures of 1 linedef");
+					General.Interface.DisplayStatus(StatusType.Action, "Cleared midtextures of 1 linedef.");
+				}
+
+				//check selection
+				foreach (VisualGeometry vg in selection)
+				{
+					if (vg.GeometryType == VisualGeometryType.WALL_MIDDLE)
+					{
+						if (vg.Sidedef.Other != null)
+						{
+							vg.Sidedef.SetTextureMid("-");
+							vg.Sidedef.Other.SetTextureMid("-");
+						}
+						vg.Sidedef.Line.SetFlag(General.Map.Config.PegMidtextureFlag, false);
+					}
+
+					vg.Sector.UpdateSectorGeometry(true);
+				}
+				//update changed geometry
+				RebuildElementData();
+				UpdateChangedObjects();
+				General.Interface.DisplayStatus(StatusType.Action, "Cleared midtextures for " + selection.Count + (selection.Count == 1 ? " surface." : " surfaces."));
+				ShowTargetInfo();
+			}
+		}
+
 		//mxd
 		[BeginAction("toggleslope")]
 		public void ToggleSlope()