diff, prevent zombie proc + leak

src/ce_diff.pas

@@ -35,30 +35,37 @@ begin
   inherited create(nil);
 
   p := TProcess.Create(self);
-  p.Executable:= 'diff' + exeExt;
+  try
+    p.Executable:= 'diff' + exeExt;
 
-  lbl.Caption:= 'The file: "' + fname2 + '" has been modified by another program.'
-    + LineEnding + 'Use the following diff to decide if the content should be '
-    + 'reloaded.';
+    lbl.Caption:= 'The file: "' + fname2 + '" has been modified by another program.'
+      + LineEnding + 'Use the following diff to decide if the content should be '
+      + 'reloaded.';
 
-  if exeInSysPath(p.Executable) then
-  begin
-    p.Parameters.Add('-u');
-    p.Parameters.Add(fname1);
-    p.Parameters.Add(fname2);
-    p.Options:= [poUsePipes];
-    p.ShowWindow:= swoHIDE;
-    p.Execute;
+    if exeInSysPath(p.Executable) then
+    begin
+      p.Parameters.Add('-u');
+      p.Parameters.Add(fname1);
+      p.Parameters.Add(fname2);
+      p.Options:= [poUsePipes];
+      p.ShowWindow:= swoHIDE;
+      p.Execute;
 
-    r := TStringList.Create;
-    try
-      processOutputToStrings(p,r);
-      editor.Lines.Assign(r);
-    finally
-      r.Free;
-    end;
+      r := TStringList.Create;
+      try
+        processOutputToStrings(p,r);
+        editor.Lines.Assign(r);
+      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
-  else editor.Lines.Add('(The "diff" tool cannot be found)');
 end;
 
 end.