Like insert, but the insertion will not occur if iter is at a
non-editable location in the buffer.
Usually you want to prevent insertions at ineditable locations if the insertion results from a user action (is interactive).
default_editable indicates the editability of text that doesn't have a tag affecting editability applied to it. Typically
the result of get_editable is appropriate here.
| this | |
| iter |
a position in this |
| text |
some UTF-8 text |
| len |
length of text in bytes, or -1 |
| default_editable |
default editability of buffer |
|
whether text was actually inserted |