_checkBackPressure should cancel any repeated consume (Fixes #325).

[vqvu]

This seems to fix the issue @svozza found in #325, but I'm not too confident in it.

Fortunately, the 3.x engine doesn't have this bug, so we should be OK long-term.

[svozza]

Poor v2, really creaking at the seams now! Out of interest, why are you unsure of how well this will work?

[vqvu]

Because the fix that I wanted to make was

diff --git a/lib/index.js b/lib/index.js
index 5ce4fd9..297cd6e 100755
--- a/lib/index.js
+++ b/lib/index.js
@@ -824,7 +824,8 @@ Stream.prototype.resume = function () {
                 this.emit('drain');
             }
         }
-    } while (this._repeat_resume);
+    } while (this._repeat_resume && !this.paused);
+    this._repeat_resume = false;
     this._resume_running = false;
 };

But this broke stream redirection for some reason, and that's the one part of the v2 engine that I don't fully understand. v3 was written because the interplay between _checkBackPressure and stream redirection was too complex for me to grok.

[vqvu]

Also, the fact that you need to mess with _repeat_resume outside of the resume function seems a bit sketchy to me.

[svozza]

Well, it might not be the optimal solution but it's still preferable to what we have now.