Luc Teirlinck <[EMAIL PROTECTED]> writes: > Kim Storm wrote: > > As I indicated in another mail today, I have been looking at a problem > with moving to the beginning of a line in a window with the following > appearence: > > abc > [ ] > x[IMAGE]yz > [ ] > def > > Now, if I place the cursor on x, and do C-e, cursor moves to z. > If I then do C-a, cursor moves to y, not x. > > The IMAGE is layed on top (via a display property) of text that ends > in a newline, so formally, C-a (beginning-of-line) DTRT. > > However, from a user point of view, this is !TRT. > > Sorry for replying so late to this, but is there some extremely good > (that is, absolutely unavoidable) reason why that image is layed on > top of text that _ends in a newline_ (or just contains newlines)? Is > that fact, rather than beginning-of-line not the problem?
For example, this is how insert-image-file works. Try to eval this in an empty buffer: (progn (insert "\nab") (insert-image-file "../etc/splash.xpm") (move-end-of-line 1) (insert "def\n")) This could be considered a bug in insert-image-file. I wonder how preview-latex handles this, as it uses images over multiline text _a lot_ ...? Does beginning-of-line work ok with images in the middle of lines? If so, how? > Trying to > "fix" the C-a behavior you consider "wrong" using > `move-beginning-of-line' is not going to change the fact that every > other Emacs command or function will still consider the offending > newline to be the end of a line _and_ to be visible (unless it has the > invisibility property). Giving newlines a display property is a very > dubious thing to do. I do not believe that very much in Emacs is > prepared for newlines with a display property. True. This _is_ a problem, but it is not new. > > Contrary to what I previously thought, this is not caused by an error > in the move_it_vertically_backward function -- it is simply the way > bolp and beginning-of-line work, i.e. they don't care if the newline > before point is invisible. > > And on top of that, unless that newline has the invisibility property, > Emacs considers it to be visible, whether the user can see it or not. True. I have tried to put invisibile property on the image text, but it doesn't give good result for me ... anybody want to experiment with that, to find something which works ? If we can fix the places where a display property gives problems, I guess we could get rid of move-beginning-of-line (or at least not have it as the default binding for C-a). -- Kim F. Storm <[EMAIL PROTECTED]> http://www.cua.dk _______________________________________________ Emacs-devel mailing list Emacs-devel@gnu.org http://lists.gnu.org/mailman/listinfo/emacs-devel
