[Touchable] "Cannot find single active touch" invariant violation when tapping with multiple fingers

[ide]

Repro: Open the "View" example screen in the UIExplorer and tap repeatedly with multiple fingers. The red box pops up with an invariant violation eventually. The more fingers you tap with (try four), the easier it is to repro.

Invariant Violation: Cannot find single active touch
    recordTouchTrack
    extractEvents
    extractEvents
    handleTopLevel
    _receiveRootNodeIDEvent
    receiveTouches
    jsCall
    _callFunction
    applyWithGuard
    guardReturn
    callFunctionReturnFlushedQueue
    [native code]
    global code

[ckknight]

This is also reproducible with the following steps:

1. Place index finger
2. Place middle finger
3. Lift index finger
4. Place index finger
5. Lift middle finger
6. Place middle finger

[mrdanjl]

+1 - Occurs when you use two finger drag on a list or scroll view

[dvdhsu]

+1. Also happens when you zoom on a ScrollView, but then lift one finger off.

This issue has been around for a while. Is there anybody interested in taking this up? I don't have the time right now, unfortunately.

Edit: Okay, actually, looking at the source code, it looks like we should just delete a few lines. The invariant seems only to be causing trouble (and is only in dev mode, anyways), so I think removing it is fine. I'll make a pull request later tonight.

[Iragne]

+1
do you create a PR ??
@dvdhsu

[dvdhsu]

Looking at the source code, this check only occurs when you're in dev mode. Seeing that it was working in production, I just ignored the problem. LMK if you still want me to make it?

[jessepollak]

+1 for this occurring in dev mode

[liubko]

+1
react-native v0.5.0

[sahrens]

I remember seeing a task about this internally that got fixed, and I can't seem to repro now. Please re-open if you can repro in v0.6.0-rc