When this functions returns false, the default activation of
proposal will take place which
replaces the word at
iter with the text of
Here is how the default activation selects the boundaries of the word to replace. The end of the word is
iter. For the start of
the word, it depends on whether a start iter is defined for
get_start_iter). If a start iter is
defined, the start of the word is the start iter. Else, the word (as long as possible) will contain only alphanumerical and the "_" characters.
true to indicate that the proposal activation has been handled, false otherwise.