Used to keep track of whether the buffer has been modified since the last time it was saved.
Whenever the buffer is saved to disk, call `gtk_text_buffer_set_modified (this, FALSE)`. When the
buffer is modified, it will automatically toggled on the modified bit again. When the modified bit flips, the buffer emits the [
[email protected]:GtkTextBuffer:modified-changed] signal.
| this |
a `GtkTextBuffer` |
| setting |
modification flag setting |