Added: Undo Limit setting

leveleditor.py

@@ -114,6 +114,8 @@ Settings.vsync = Settings("vertical sync", 0)
 Settings.visibilityCheck = Settings("visibility check", False)
 Settings.viewMode = Settings("View Mode", "Camera")
 
+Settings.undoLimit = Settings("Undo Limit", 20)
+
 ControlSettings = config.Settings("Controls")
 ControlSettings.mouseSpeed = ControlSettings("mouse speed", 5.0)
 ControlSettings.cameraAccel = ControlSettings("camera acceleration", 125.0)
@@ -1513,7 +1515,9 @@ class LevelEditor(GLViewport):
         self.viewportContainer.top = row.bottom
         self.viewportContainer.size = self.mainViewport.size
         self.add(self.viewportContainer)
+
         Settings.viewMode.addObserver(self)
+        Settings.undoLimit.addObserver(self)
 
         self.reloadToolbar()
 
@@ -3363,6 +3367,9 @@ class LevelEditor(GLViewport):
     def addOperation(self, op):
         if self.recordUndo:
             self.undoStack.append(op)
+            if len(self.undoStack) > self.undoLimit:
+                self.undoStack.pop(0)
+
         self.performWithRetry(op)
 
     recordUndo = True

mcedit.py

@@ -493,6 +493,9 @@ class OptionsPanel(Dialog):
         mouseSpeedRow = mceutils.FloatInputRow("Mouse Speed: ",
             ref=ControlSettings.mouseSpeed.propertyRef(), width=100, min=0.1, max=20.0)
 
+        undoLimitRow = mceutils.IntInputRow("Undo Limit: ",
+            ref=Settings.undoLimit.propertyRef(), width=100, min=0)
+
         invertRow = mceutils.CheckBoxLabel("Invert Mouse",
             ref=ControlSettings.invertMousePitch.propertyRef(),
             tooltipText="Reverse the up and down motion of the mouse.")
@@ -542,6 +545,7 @@ class OptionsPanel(Dialog):
             cameraBrakeSpeedRow,
             blockBufferRow,
             mouseSpeedRow,
+            undoLimitRow,
         )
 
         options = (