Unchanged script editor skips implicit save (#543)

Stop calling ScriptFileDocumentTab.RemoveTrailingWhitespace()
on a text editor that has unchanged text. This causes the
currently-opened map to be marked 'isChanged == true' when
nothing is modified.

Source/Core/Controls/Scripting/ScriptLumpDocumentTab.cs

@@ -73,6 +73,7 @@ namespace CodeImp.DoomBuilder.Controls
 			{
 				editor.SetText(stream.ToArray()); //mxd
 				editor.ClearUndoRedo();
+				editor.SetSavePoint();
 			}
 
 			// Set title
@@ -108,6 +109,8 @@ namespace CodeImp.DoomBuilder.Controls
 		// Implicit save
 		public override bool Save()
 		{
+			if (!editor.IsChanged) return false;
+
             // [ZZ] remove trailing whitespace
             RemoveTrailingWhitespace();
 

Source/Core/Controls/Scripting/ScriptResourceDocumentTab.cs

@@ -48,6 +48,7 @@ namespace CodeImp.DoomBuilder.Controls
 				editor.SetText(stream.ToArray());
 				editor.Scintilla.ReadOnly = source.IsReadOnly;
 				editor.ClearUndoRedo();
+				editor.SetSavePoint();
 			}
 			else
 			{
@@ -92,7 +93,7 @@ namespace CodeImp.DoomBuilder.Controls
 		// Return true when successfully saved
 		public override bool Save()
 		{
-			if(source.IsReadOnly) return false;
+			if(source.IsReadOnly || !editor.IsChanged) return false;
 
             // [ZZ] remove trailing whitespace
             RemoveTrailingWhitespace();