merge: do early copy to deal with issue636
Without copies/renames, merges source names are 1:1 with their
targets. Copies and renames introduce the possibility that there will
be two merges with the same input but different output. By doing the
copy to the destination name before the merge, the actual merge
becomes 1:1 again, and no source is the input to two different merges.
- add a preliminary scan to applyupdates to do copies
- for the merge action, pass the old name (for finding ancestors) and
the new name (for input to the merge) to filemerge
- eliminate the old post-merge copy
- lookup file contents from new name in filemerge
- pass new name to external merge helper
- report merge failure at new name
- add a test
adding foo
>>> two diffs showing three added lines <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
+
hello world
+
goodbye world
+
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
+
hello world
+
goodbye world
+
>>> no diffs <<<
hg diff -B
hg diff -Bb
>>> four diffs showing added space first on the first line <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+ hello world
goodbye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+ hello world
goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+ hello world
goodbye world
hg diff -Bb
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+ hello world
goodbye world
>>> two diffs showing space appended to the first line <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+hello world
goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
+hello world
goodbye world
>>> no diffs <<<
hg diff -b
hg diff -Bb
>>> four diffs showing space inserted into "goodbye" <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+good bye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+good bye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+good bye world
hg diff -Bb
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+good bye world
>>> two diffs showing changed whitespace amount in the last line <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
hello world
-goodbye world
+goodbye world
>>> no diffs <<<
hg diff -b
hg diff -Bb
>>> four diffs showing added blank line w/horizontal space <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
hello world
+
goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
hello world
+
goodbye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
hello world
+
goodbye world
hg diff -Bb
>>> three diffs showing added blank line w/other space <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
-hello world
-goodbye world
+hello world
+
+goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
-hello world
-goodbye world
+hello world
+
+goodbye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,3 @@ hello world
-hello world
-goodbye world
+hello world
+
+goodbye world
hg diff -Bb
>>> four diffs showing changed whitespace <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
-goodbye world
+helloworld
+goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
-goodbye world
+helloworld
+goodbye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
-goodbye world
+helloworld
+goodbye world
hg diff -Bb
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,2 @@ hello world
-hello world
-goodbye world
+helloworld
+goodbye world
hg diff -w
>>> five diffs showing changed whitespace <<<
hg diff
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
-hello world
-goodbye world
+helloworld
+
+
+
+goodbye world
hg diff -B
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
-hello world
-goodbye world
+helloworld
+
+
+
+goodbye world
hg diff -b
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
-hello world
-goodbye world
+helloworld
+
+
+
+goodbye world
hg diff -Bb
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
-hello world
-goodbye world
+helloworld
+
+
+
+goodbye world
hg diff -w
diff -r 540c40a65b78 foo
--- a/foo
+++ b/foo
@@ -1,2 +1,5 @@ hello world
-hello world
-goodbye world
+helloworld
+
+
+
+goodbye world
hg diff -wB