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Johannes Sixt c7f7457026 git-gui: "Stage Line": Treat independent changes in adjacent lines better Assume that we want to commit these states: Old state == HEAD Intermediate state New state -------------------------------------------------------- context before context before context before old 1 new 1 new 1 old 2 old 2 new 2 context after context after context after that is, want to commit two changes in this order: 1. transform "old 1" into "new 1" 2. transform "old 2" into "new 2" [This discussion and this patch is about this very case and one other case as outlined below; any other intermediate states that one could imagine are not affected by this patch.] Now assume further, that we have not staged and commited anything, but we have already changed the working file to the new state. Then we will see this hunk in the "Unstaged Changes": @@ -1,4 +1,4 @@ context before -old 1 -old 2 +new 1 +new 2 context after The obvious way to stage the intermediate state is to apply "Stage This Line" to "-old 1" and "+new 1". Unfortunately, this resulted in this intermediate state: context before old 2 new 1 context after which is not what we wanted. In fact, it was impossible to stage the intermediate state using "Stage Line". The crux was that if a "+" line was staged, then the "-" lines were converted to context lines and arranged before the "+" line in the forged hunk that we fed to 'git apply'. With this patch we now treat "+" lines that are staged differently. In particular, the "-" lines before the "+" block are moved after the staged "+" line. Now it is possible to get the correct intermediate state by staging "-old 1" and "+new 1". Problem solved. But there is a catch. Noticing that we didn't get the right intermediate state by staging "-old 1" and "+new 1", we could have had the idea to stage the complete hunk and to unstage "-old 2" and "+new 2". But... the result is the same. The reason is that there is the exact symmetric problem with unstaging the last "-" and "+" line that are in adjacent blocks of "-" and "+" lines. This patch does not change the way in which "-" lines are unstaged. Why? Because if we did (i.e. move "+" lines before the "-" line after converting them to context lines), then it would be impossible to stage this intermediate state: context before old 1 new 2 context after that is, it would be impossible to stage the two independet changes in the opposite order. Let's look at this case a bit further: The obvious way to get this intermediate state would be to apply "Stage This Line" to "-old 2" and "+new 2". Before this patch, this worked as expected. With this patch, it does not work as expected, but it can still be achieved by first staging the entire hunk, then unstaging "-old 1" and "+new 1". In summary, this patch makes a common case possible, at the expense that a less common case is made more complicated for the user. Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>		17 years ago
lib	git-gui: "Stage Line": Treat independent changes in adjacent lines better	17 years ago
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