t3200: avoid variations of the master branch name

To avoid branch names with a loaded history, we already started to avoid
using the name "master" in a couple instances.

The `t3200-branch.sh` script uses variations of this name for branches
other than the default one. So let's change those names, as
"lowest-hanging fruits" in the effort to use more inclusive naming
throughout Git's source code. While at it, make those branch names
independent from the default branch name.

In this particular instance, this rename requires a couple of
non-trivial adjustments, as the aligned output depends on the maximum
length of the displayed branches (which we now changed), and also on the
alphabetical order (which we now changed, too).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t3200-branch.sh

@@ -234,10 +234,10 @@ test_expect_success 'git branch -M master master should work when master is chec
 	git branch -M master master
 '
 
-test_expect_success 'git branch -M master2 master2 should work when master is checked out' '
+test_expect_success 'git branch -M topic topic should work when master is checked out' '
 	git checkout master &&
-	git branch master2 &&
+	git branch topic &&
-	git branch -M master2 master2
+	git branch -M topic topic
 '
 
 test_expect_success 'git branch -v -d t should work' '
@@ -324,8 +324,8 @@ test_expect_success 'git branch --list -v with --abbrev' '
 test_expect_success 'git branch --column' '
 	COLUMNS=81 git branch --column=column >actual &&
 	cat >expect <<\EOF &&
-  a/b/c     bam       foo       l       * master    mb        o/o       q
+  a/b/c    bam      foo      l      * master   n        o/p      r
-  abc       bar       j/k       m/m       master2   n         o/p       r
+  abc      bar      j/k      m/m      mb       o/o      q        topic
 EOF
 	test_cmp expect actual
 '
@@ -346,13 +346,13 @@ test_expect_success 'git branch --column with an extremely long branch name' '
   l
   m/m
 * master
-  master2
   mb
   n
   o/o
   o/p
   q
   r
+  topic
   $long
 EOF
 	test_cmp expect actual
@@ -365,8 +365,8 @@ test_expect_success 'git branch with column.*' '
 	git config --unset column.branch &&
 	git config --unset column.ui &&
 	cat >expect <<\EOF &&
-  a/b/c   bam   foo   l   * master    mb   o/o   q
+  a/b/c   bam   foo   l   * master   n     o/p   r
-  abc     bar   j/k   m/m   master2   n    o/p   r
+  abc     bar   j/k   m/m   mb       o/o   q     topic
 EOF
 	test_cmp expect actual
 '
@@ -377,7 +377,7 @@ test_expect_success 'git branch --column -v should fail' '
 
 test_expect_success 'git branch -v with column.ui ignored' '
 	git config column.ui column &&
-	COLUMNS=80 git branch -v | cut -c -10 | sed "s/ *$//" >actual &&
+	COLUMNS=80 git branch -v | cut -c -9 | sed "s/ *$//" >actual &&
 	git config --unset column.ui &&
 	cat >expect <<\EOF &&
   a/b/c
@@ -389,13 +389,13 @@ test_expect_success 'git branch -v with column.ui ignored' '
   l
   m/m
 * master
-  master2
   mb
   n
   o/o
   o/p
   q
   r
+  topic
 EOF
 	test_cmp expect actual
 '
@@ -597,10 +597,10 @@ test_expect_success 'git branch -C master master should work when master is chec
 	git branch -C master master
 '
 
-test_expect_success 'git branch -C master5 master5 should work when master is checked out' '
+test_expect_success 'git branch -C main5 main5 should work when master is checked out' '
 	git checkout master &&
-	git branch master5 &&
+	git branch main5 &&
-	git branch -C master5 master5
+	git branch -C main5 main5
 '
 
 test_expect_success 'git branch -C ab cd should overwrite existing config for cd' '
@@ -711,11 +711,11 @@ test_expect_success 'deleting a self-referential symref' '
 '
 
 test_expect_success 'renaming a symref is not allowed' '
-	git symbolic-ref refs/heads/master2 refs/heads/master &&
+	git symbolic-ref refs/heads/topic refs/heads/master &&
-	test_must_fail git branch -m master2 master3 &&
+	test_must_fail git branch -m topic new-topic &&
-	git symbolic-ref refs/heads/master2 &&
+	git symbolic-ref refs/heads/topic &&
 	test_path_is_file .git/refs/heads/master &&
-	test_path_is_missing .git/refs/heads/master3
+	test_path_is_missing .git/refs/heads/new-topic
 '
 
 test_expect_success SYMLINKS 'git branch -m u v should fail when the reflog for u is a symlink' '