patch 8.0.0334: can't access b:changedtick from a dict reference
Problem: Can't access b:changedtick from a dict reference.
Solution: Make changedtick a member of the b: dict. (inspired by neovim
#6112)
diff --git a/src/testdir/test_changedtick.vim b/src/testdir/test_changedtick.vim
new file mode 100644
index 0000000..f273f0f
--- /dev/null
+++ b/src/testdir/test_changedtick.vim
@@ -0,0 +1,45 @@
+" Tests for b:changedtick
+
+func Test_changedtick_increments()
+ new
+ " New buffer has an empty line, tick starts at 2.
+ let expected = 2
+ call assert_equal(expected, b:changedtick)
+ call assert_equal(expected, b:['changedtick'])
+ call setline(1, 'hello')
+ let expected += 1
+ call assert_equal(expected, b:changedtick)
+ call assert_equal(expected, b:['changedtick'])
+ undo
+ " Somehow undo counts as two changes.
+ let expected += 2
+ call assert_equal(expected, b:changedtick)
+ call assert_equal(expected, b:['changedtick'])
+ bwipe!
+endfunc
+
+func Test_changedtick_dict_entry()
+ let d = b:
+ call assert_equal(b:changedtick, d['changedtick'])
+endfunc
+
+func Test_changedtick_bdel()
+ new
+ let bnr = bufnr('%')
+ let v = b:changedtick
+ bdel
+ " Delete counts as a change too.
+ call assert_equal(v + 1, getbufvar(bnr, 'changedtick'))
+endfunc
+
+func Test_changedtick_fixed()
+ call assert_fails('let b:changedtick = 4', 'E46')
+ call assert_fails('let b:["changedtick"] = 4', 'E46')
+
+ call assert_fails('unlet b:changedtick', 'E795')
+ call assert_fails('unlet b:["changedtick"]', 'E46')
+
+ let d = b:
+ call assert_fails('unlet d["changedtick"]', 'E46')
+
+endfunc