Another regression: std.range.slide

[H. S. Teoh]

https://issues.dlang.org/show_bug.cgi?id=23976

Caused by: https://github.com/dlang/phobos/pull/8738
(commit 8a9cfa2677)

Brief summary:

-----------
import std;
void main() {
	auto input = "1<2";
	foreach (pair; input.splitter("<").slide(2))
	{
		writeln(pair);
	}
}
-----------

Output before commit 8a9cfa2677:
-----------
["1", "2"]
-----------

Output after commit 8a9cfa2677:
-----------
["1", "2"]
["2"]
-----------

This is incorrect because the code asked for a window of size 2, with
the default option of No.withPartial.

This broke another of my old projects that relied on the old (correct)
behaviour. :-/


T

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