[Bug 2061978] Re: Pressing enter on close button of out-of-date cache dialog still triggers the reload button

[Nathan Teodosio]

** Merge proposal linked:
   https://code.launchpad.net/~nteodosio/software-properties/+git/software-properties/+merge/464507

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https://bugs.launchpad.net/bugs/2061978

Title:
  Pressing enter on close button of out-of-date cache dialog still
  triggers the reload button

Status in software-properties package in Ubuntu:
  Triaged

Bug description:
  Start software-properties-gtk, make any change in the sources
  configuration, e.g. by just toggling universe check button, enter your
  password and click close.

  A dialog appears saying that

  > To install software and updates from newly added or changed sources,
  you have to reload the information about available software.

  with a reload and a close button.

  Press the right arrow key and close will be selected in the interface,
  evidenced by a faint border around that button. Press the enter key.

  - Expected: The close button becomes dark for a brief moment, indicating that it has been pressed, and the program exits immediately.
  - Observed: The reload button becomes dark for a brief moment, indicating that it has been pressed, and the program starts updating the cache.

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