Re: [PATCH] Teach git-gui to split hunks

[Junio C Hamano <gitster@pobox.com>]

Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:

> When you select the context menu item "Split Hunk" in the diff area,
> git-gui will now split the current hunk so that a new hunk starts at
> the current position.
>
> For this to work, apply has to be called with --unidiff-zero, since
> the new hunks can start or stop with a "-" or "+" line.
> ...

I still have conceptual problem with this whole thing.  For example,
what does that MEAN to split this hunk from your patch...

> @@ -296,7 +369,7 @@ proc apply_hunk {x y} {
>  	if {$current_diff_path eq {} || $current_diff_header eq {}} return
>  	if {![lock_index apply_hunk]} return
>  
> -	set apply_cmd {apply --cached --whitespace=nowarn}
> +	set apply_cmd {apply --cached --whitespace=nowarn --unidiff-zero}
>  	set mi [lindex $file_states($current_diff_path) 0]
>  	if {$current_diff_side eq $ui_index} {
>  		set failed_msg [mc "Failed to unstage selected hunk."]

... by clicking between the '-' and '+' lines, and apply only one half?

Well, the question was not very well stated.  I know what it means --
remove that old line, without replacing with the corrected/updated one.
The real question is how would that be useful?