pgAdmim 1.12 on WinXP SP3 but this issue was observed in previous releases
also
When in table view window applied filter and no rows returned (no row
matches the filter rull) then it is not possible to fire context menu of the
grid and pick up "Remove filter". In order to reload all rows one needs to
click Filter icon, go to Filter tab, clear filter rule and close with OK.
This is due to this context menu can be fired only on row