New QGIS user, Brighton 2.6. I accidentally deleted an elongated (lots of "peninsulas" polygon that represents a stream-based habitat - two gaps on SW boundary and two on the northern boundary (leaving a small 'island' or floating polgyon.
It seems that one of the tools would allow quick closure of this area to draw back into as a record. There are four gaps at the formerly contiguous boundary, but if I could sketch a line across these gaps and close the area back in, that would be ideal.
Answer
There should be a pretty simple solution to your issue. You can draw a polygon which will not overlap any other polygons in the same layer.
This is done by ticking the "Avoid Intersections" tick box in the snapping options (Settings> Snapping Options)
In QGIS 2.8 this is done through the "Advanced" mode, in 2,6 it should be the basic snapping options:
Then you can draw a large polygon, and snapping to your entrances as mentioned, but the polygon you draw will follow the boundary of the other polygons in the layer and not overlap them.
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