Add the ability (per config) to avoid opening a source file twice

[StephanHartmann]

Hi,

when I double click on a file in the member browser, the file is opened as a new editor tab.
When I double click on the same file later, it is also opened in a new editor tab.

It would be great when (as an option) the previously already opened tab will be shown instead of opening a new tab.

best regards
Stephan

[Smith5646]

If possible, it would be great if this could ask if we want a new version opened (in read-only mode) or want the existing one brought back to the top. There have been are a lot of times when working in SEU (sorry for swearing) that I opened the same member a second time in read only mode so I could see the original code and compare it to what I had now or to see something like a DS so I knew the sequence it was in while writing an SQL select.