Activate proposal at iter.
When this functions returns false, the default activation of proposal will take place
which replaces the word at iter with the text of proposal (see
get_text).
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 proposal (see
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.
| this | |
| proposal | |
| iter |
a TextIter. |
|
true to indicate that the proposal activation has been handled, false otherwise. |