Code distorting in text (re: #218)

[brideylea]

Hi Conal,

Submitting this bug on behalf of Gari. This is in reference to a previous Github issue (#218). When working on a transcription, errors are occurring in the code when highlighting text. In some instances clicking 'save' corrects the code, but other times the code is actually changing (not just superficially) and resulting in errors e.g. line 7 in the first image and line 8 in the second image.

See also images 3 and 4 for further instances.

[gurridhala]

Is anyone working on this issue? It is still happening and I first posted the issue over 14 months ago.

[brideylea]

Hi @r-tae

Not sure if this is in your wheelhouse. If it is would you be able to check it out please?

Thank you!
Bridey

[r-tae]

Thanks Bridey, I'll look into this; definitely my wheelhouse

This looks like a nasty bug, but the video in #218 should be helpful for diagnosing it

[r-tae]

@brideylea @gurridhala I've tried to reproduce this (I'm also on MacOS), I've only been able to do so in Firefox; I can only make it happen maybe once every 10-15 tries and I can only do so by:

1. making a selection
2. dragging the selection (this is only possible in firefox) to move it somewhere else in the document
3. pressing cmd-z to undo and then selecting somewhere else in the document

Do you have another way that reproduces it more reliably? This is a bug in codemirror (or, at least, out use of codemirror) and that's a particularly complex library and at this rate I think it would take a long time for me to even find a cause, let alone fix it

[r-tae]

For my own future reference, I can reproduce it in a document with no soft line wraps.

[r-tae]

I can reproduce it if I replace the entire document with a different one (valid xml) before testing; so its not related some weird bleedthrough of the initial state into the current working state.

If I put a line break in the middle of every <line></line> then it's reproducible, but is restricted to the end of every second line; meaning it follows the closing </line> tags.

It is reproducible if I rename every <line> tag to <lime> or <a>; not if I remove all <line>s; but if I then add a <a /> to the end of every line its reproducible again

Very bizarre but at least I have some leads