This function is used to determine if a character inserted into the text
editor should cause a new completion request to be triggered.
An example would be period '.' which might indicate that the user wants
to complete method or field names of an object.
This method will only trigger when text is inserted into the #GtkTextBuffer
while the completion list is visible and a proposal is selected. Incremental
key-presses (like shift, control, or alt) are not triggerable.
This function is used to determine if a character inserted into the text editor should cause a new completion request to be triggered.
An example would be period '.' which might indicate that the user wants to complete method or field names of an object.
This method will only trigger when text is inserted into the #GtkTextBuffer while the completion list is visible and a proposal is selected. Incremental key-presses (like shift, control, or alt) are not triggerable.