Stashed change selected is not persisted across changed tabs

[richardtop]

Steps:

1. Have at least 2 stashed changes in the "stashes" (CMD+3)
2. Open "stashes" (CMD+3) and select 2nd stash, so that it becomes highlighted
3. Open another tab, e.g. a tree (CMD+1) or a commit editor (CMD+2)
4. Go back to the "stashes" (CMD+3)

Expected result:

• The 2nd stash is still highlighted and selected

Actual result:

• The selection always resets to the 1st stash regardless of what has been selected before.