the computed go-to command (O) is now 0-indexed and all invalid indexes and empty labels are ignored

* This has long been a TECO-11 incompatibility.
* The first label in a list has index 0, i.e. `1Ofoo,bar$` jumps to label `!bar!`.
  Consequently 0 is also implied, so `Olabel$` continues to do what you expect.
* `0Ofoo$` was previously also jumping to `!foo!` which was inconsistent:
  All invalid indexes should do nothing, i.e. execution continues after the go-to command.
* Fixed handling of empty labels as in `1Ofoo,,bar$` - execution should also continue
  after the command.
  This eases writing "default" clauses immediately after the go-to.
* The ED hook values now also begin at 0, so most existing ED hook macros should
  continue to work.
* Similarily, the mouse events returned by -EJ also begin at 0 now,
  so fnkeys.tes continues to work as expected.
* It's still very possible of course that this breaks existing code.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/qreg.h b/src/qreg.h
index 2b970aa..6daaff3 100644
--- a/src/qreg.h
+++ b/src/qreg.h
@@ -239,7 +239,7 @@ gboolean teco_qreg_stack_pop(teco_qreg_t *qreg, GError **error);
 void teco_qreg_stack_clear(void);
 
 typedef enum {
-	TECO_ED_HOOK_ADD = 1,
+	TECO_ED_HOOK_ADD = 0,
 	TECO_ED_HOOK_EDIT,
 	TECO_ED_HOOK_CLOSE,
 	TECO_ED_HOOK_QUIT