racket / racket/drracket

Internal error: starting index is out of range

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bug
Dominant language
Racket
Stars
516
Forks
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Description

open-input-text-editor: starting index is out of range
  starting index: 19
  valid range: [0, 18]
  editor: (object:add-on-paint-logging ...)
  context...:
   /Users/sorawee/projects/racket/extra-pkgs/gui/gui-lib/mred/private/snipfile.rkt:24:4: open-input-text-editor
   /Users/sorawee/projects/racket/extra-pkgs/gui/gui-lib/framework/private/color.rkt:592:4: colorer-driver method in text-mixin
   /Users/sorawee/projects/racket/extra-pkgs/gui/gui-lib/framework/private/color.rkt:615:4: colorer-callback method in text-mixin
   /Users/sorawee/projects/racket/extra-pkgs/gui/gui-lib/mred/private/wx/common/queue.rkt:435:6
   /Users/sorawee/projects/racket/extra-pkgs/gui/gui-lib/mred/private/wx/common/queue.rkt:433:3

Steps to reproduce:

  1. Open a new tab.
  2. Paste (('x (#<))).
  3. Undo.

The internal error should occur.

EDITED: sorry, should have put this in racket/gui. Feel free to move if anyone wants to.

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the error in DrRacket with a new tab, the pasted text (('x (#<))), and Undo. Read gui-lib/mred/private/snipfile.rkt around open-input-text-editor and gui-lib/framework/private/color.rkt around the colorer-driver and colorer-callback; done means the reproduction no longer raises the internal error.

Written by the indexing model from the issue text.

Assessment

Domain
desktop, devtools
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
35/100

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