DoubleClickAction on a prefiltered TableDisplay

Ok, I am playing with the TableDisplay as described in your Python Table API:

```
mapList4 = [
{"a":1, "b":2, "c":3},
{"a":4, "b":5, "c":6},
{"a":7, "b":8, "c":5}
]
display = TableDisplay(mapList4)

def dclick(row, column, tabledisplay):
tabledisplay.values[row][column] = sum(map(int,tabledisplay.values[row]))

display.setDoubleClickAction(dclick)

def negate(row, column, tabledisplay):
tabledisplay.values[row][column] = -1 * int(tabledisplay.values[row][column])

def incr(row, column, tabledisplay):
tabledisplay.values[row][column] = int(tabledisplay.values[row][column]) + 1

display.addContextMenuItem("negate", negate)
display.addContextMenuItem("increment", incr)

display
```
This works like a charm. However, if I restrict the rows displayed by searching for a particular substring it all falls over. row and column still refer to the full display, e.g. let's say I only display the row with Index 2. Beakerx assumes I have clicked on row 0 and will apply the maths to this row rather than row 2 of the visible display. Does this make sense?