[Bug 1453496] [NEW] "Open" button gets not grayed out for invalid repositories

[Sworddragon]

Public bug reported:

I'm using Ubuntu 15.04 with git-gui 1:2.1.4-2.1 and on opening git-gui
and clicking "Open Existing Repository" the "Open" button doesn't get
grayed out if the path points to an invalid repository (for example a
file) while the "OK" button in the window if clicking on "Browse" does.
Maybe the "Open" button can get grayed out then too.

** Affects: git (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1453496

Title:
  "Open" button gets not grayed out for invalid repositories

Status in git package in Ubuntu:
  New

Bug description:
  I'm using Ubuntu 15.04 with git-gui 1:2.1.4-2.1 and on opening git-gui
  and clicking "Open Existing Repository" the "Open" button doesn't get
  grayed out if the path points to an invalid repository (for example a
  file) while the "OK" button in the window if clicking on "Browse"
  does. Maybe the "Open" button can get grayed out then too.

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