Commented Unassigned: [Regression] Package Sources dialog: the feed source cannot be edited anymore [3338]

Repro steps:
1. open Settings dialog and go to Package Source
2. select any of the existing sources, try to edit the Source
3. or create a new package source, edit the Source in the Source: textbox


Expected: Sources can be edited


Actual: not accepting keystrokes
Comments: Fixed in changeset 2b933870bcfe71cb60381cd7fbd3a9c4bd1d3ca5