Fix intent check bypassed due to init setting

[inDream]

Currently hasIntent part of dragging would never entered as hasIntent is undefined.

[ronmichael]

I ran into this too. Although I went with a different solution: around like 511 I replaced

       if (cache.hasIntent === false || cache.hasIntent === null) 

with

       if (!cache.intentChecked)

[inDream]

Both solution work, but I think it's better to set an init value for reference.