instead of relying on Scintilla undo actions, use SciTECO undo tokens exclusivelyHEADmaster-fmsbw-cimaster

Previously we were using both Scintilla undo actions and our own undo tokens
and both had to be coordinated via `undo__teco_interface_ssm(SCI_UNDO, 0, 0)`.
This was error prone since we have to predict when an undo action is actually
generated. Furthermore, you had to update SCI_SETUNDOCOLLECTION on all buffers
and the Q-Reg view whenever switching to and from interactive mode.
Also, this probably wasted memory for the doubled undo bookkeeping.
Now, we always set SCI_SETUNDOCOLLECTION(FALSE), even in interactive mode.
teco_undo_view_insert() was introduced to undo text deletions.
While this saves almost no lines of code, it's just a clearer and simpler
architecture.

1 files changed, 0 insertions, 2 deletions

diff --git a/src/ring.h b/src/ring.h
index 126f455..f5606d1 100644
--- a/src/ring.h
+++ b/src/ring.h
@@ -121,8 +121,6 @@ teco_ring_undo_edit(void)
 gboolean teco_ring_close(teco_buffer_t *buffer, GError **error);
 void teco_ring_undo_close(void);
 
-void teco_ring_set_scintilla_undo(gboolean state);
-
 gboolean teco_ring_sync_lsp(GError **error);
 
 void teco_ring_cleanup(void);