bug#60666: 30.0.50; [PATCH] Use field properties in Eshell buffers

[Jim Porter]

This was prompted by a small annoyance I noticed in Eshell. When 
entering a command in an Eshell buffer, "C-a" takes you to the beginning 
of your input, but the Home key takes you all the way to the beginning 
of the line (so that the point is located within the the actual prompt 
text).

After digging through the Eshell code, I realized that this was because 
Eshell binds C-a to 'eshell-bol', but doesn't do the same for Home. The 
easiest way to fix this would be to add a binging for Home. However, 
when comparing this code to that of 'M-x shell', I noticed that the 
latter uses field properties to delimit parts of the shell buffer so 
that things Just Work. I think that's a more-robust way of doing things, 
and it would be nice to make Eshell do the same.

Attached are some patches to do this. Aside from the user-facing change 
that the Home key works like C-a now, this also means that users don't 
have to set 'eshell-prompt-regexp' anymore (unless they want to use 
paragraph navigation, that is). In fact, maybe it would be better to map 
M-{ and M-} to 'eshell-prompt-(previous|next)'. That would have the same 
effect as '(backward|forward)-paragraph' (I think), but it would be more 
robust.

Any thoughts here?

0001-Set-the-field-property-for-Eshell-output.patch
Description: Text document

0002-Make-eshell-bol-obsolete.patch
Description: Text document

0003-Use-the-field-property-to-navigate-through-Eshell-pr.patch
Description: Text document