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Hi,

I just noticed this strange behaviour in TeXmacs.

When text contains folds, then alt-backspace (remove previous field) will delete the field BEFORE the fold. Here is an example.

Lets us say I have an R session in TeXmacs, which contains the following:

> a=1
> b=2
> c=3
> |

My cursor is where the '|' is. If I hit alt-backspace, the 'c=3' line is deleted. Now things look like this:

> a=1
> b=2
> |

Let us say now I add a text field to the 'b=2' line. I go up, hit 'alt- right'. A text field is inserted before the b=2 line. I add a text comment there. Things now look like this:

> a=1
o This is a comment that explains why b=2
> b=2
> |

I got back to my original place, at the end.
Now I hit alt-backspace. Instead of deleting the 'b=2' line, or the whole 'b=2' block with the comment, now the 'a=2' line is deleted! A bit unexpected. We end up with:

o This is a comment that explains why b=2
> b=2
> |

It often happened to me that I tried deleting a big block, and by the time I understood that I actually had hit the alt-backspace key hard enough, many lines before the block were deleted without me noticing. Or maybe I thought 'strange, before that block was another, identical block. Well, lets delete that one, too.' It is very dangerous to delete things that the user doesn't see and for which there is no visual feedback that something was deleted.

I think that one of the following should happen:
1. Delete nothing. Alt-backspace simply doesn't work in front of a folded block.
2. Delete inside the block, the last line, or the block if there is only one line.
3. Delete the whole block.

Michael

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• [TeXmacs] Problem with 'remove previous field' when folds exist, Michael Lachmann, 08/30/2010

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