[racket-dev] DrRacket's `Install Package' dies with long names/urls

Hello devs,

This week, at least 2 students destroyed the File -> Install Package
feature of DrRacket on their machines. The students copied a URL into
the Package Source field several times, resulting in this error.
Appearently, the only way to solve this problem is to delete
racket-prefs.rktd.

Steps to reproduce:

1) Open DrRacket
2) Go to File -> Install a Package
3) Copy and paste a large chunk of text (such as [2]) into the Package Source field
4) Click install. An error message will ensue [1]
5) Go to File -> Install a Pacakge. An error message will ensue [1]


[1] 
  set-label in control<%>: contract violation
  expected: (or/c label-string? (is-a?/c bitmap%))
  given: "raco pkg install --deps fail --link \"\n   Great and manifold were the blessings, most dread Sovereign, which\n   Almighty God, the Father of all mercies, bestowed upon us the people of\n   England, when first he sent Your Majesty's Royal Person to rul...
  context...:
   /workspace/racket/racket/collects/racket/private/more-scheme.rkt:264:2: call-with-exception-handler
   /workspace/racket/pkgs/gui-pkg-manager-pkgs/gui-pkg-manager-lib/pkg/gui/by-source.rkt:64:2
   /workspace/racket/racket/collects/racket/private/class-internal.rkt:4070:0: continue-make-object
   /workspace/racket/racket/collects/racket/private/class-internal.rkt:4051:0: do-make-object
   /workspace/racket/pkgs/gui-pkg-manager-pkgs/gui-pkg-manager-lib/pkg/gui/main.rkt:41:0: make-pkg-installer8
   /workspace/racket/pkgs/gui-pkgs/gui-lib/mred/private/mrmenu.rkt:250:14: command method in basic-selectable-menu-item%
   /workspace/racket/racket/collects/racket/private/more-scheme.rkt:147:2: call-with-break-parameterization
   /workspace/racket/racket/collects/racket/private/more-scheme.rkt:264:2: call-with-exception-handler
   /workspace/racket/pkgs/gui-pkgs/gui-lib/mred/private/wx/common/queue.rkt:451:6
   /workspace/racket/pkgs/gui-pkgs/gui-lib/mred/private/wx/common/queue.rkt:502:32
   /workspace/racket/pkgs/gui-pkgs/gui-lib/mred/private/wx/common/queue.rkt:650:3
[2]
   Great and manifold were the blessings, most dread Sovereign, which
   Almighty God, the Father of all mercies, bestowed upon us the people of
   England, when first he sent Your Majesty's Royal Person to rule and
   reign over us. For whereas it was the expectation of many, who wished
   not well unto our Sion, that, upon the setting of that bright
   Occindental Star, Queen Elizabeth, of most happy memory, some thick and
   palpable clouds of darkness would so have overshadowed this land, that
   men should have been in doubt which way they were to walk, and that it
   should hardly be known who was to direct the unsettled State; the
   appearance of Your Majesty, as of the Sun in his strength, instantly
   dispelled those supposed and surmised mists, and gave unto all that
   were well affected exceeding cause of comfort; especially when we
   beheld the Government established in Your Highness, and Your hopeful
   Seed, by an undoubted Title; and this also accompanied with peace and
   tranquillity at home and abroad.

-- 
William J. Bowman

Northeastern University
College of Computer and Information Science
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