diff, prevent zombie proc + leak

src/ce_diff.pas

@@ -35,6 +35,7 @@ begin
   inherited create(nil);
 
   p := TProcess.Create(self);
+  try
     p.Executable:= 'diff' + exeExt;
 
     lbl.Caption:= 'The file: "' + fname2 + '" has been modified by another program.'
@@ -57,8 +58,14 @@ begin
       finally
         r.Free;
       end;
+
+      while p.Running do
+        sleep(1);
     end
     else editor.Lines.Add('(The "diff" tool cannot be found)');
+  finally
+    p.Free;
+  end
 end;
 
 end.