Gtk: disabled ^Z suspension on Unix for the time being

* This has always been broken as Gtk will not hide the
  window before suspending.
* It has been deemed to complicated to implement at the moment.
  Even if we can catch SIGTSTP (not that trivial), it seems to be
  impossible - at least without some lower level Xlib interaction -
  to hide the program window before raising SIGTSTP.
* Even if everything worked, it is unclear whether it is actually
  desirable to suspend a GUI application - ^Z may be pressed accidentally
  and it will be inconvenient to resume the job.
  So we would additionally have to check for the existence of
  an attached console.

1 files changed, 15 insertions, 0 deletions

diff --git a/TODO b/TODO
index ca073c3..b1d98c2 100644
--- a/TODO
+++ b/TODO
@@ -80,6 +80,21 @@ Known Bugs:
    logging system.
  * Out-of-tree builds are broken.
    See contrib/scintilla.am.
+ * Gtk on Unix: On ^Z, we do not suspend properly. The window is still shown.
+   Perhaps we should try to catch SIGTSTP?
+   This does not work with g_unix_signal_add(), though, so any
+   workaround would be tricky.
+   We could create a pipe via g_unix_open_pipe() which we
+   write to using write() in a normal signal handler.
+   We can then add a watcher using g_unix_fd_add() which will
+   hide the main window.
+   Unfortunately, it is also not trivial to get notified when
+   the window has really been hidden/unrealized.
+   Even if everything worked, it might well be annoying if
+   you accidentally suspend your instance while not being
+   connected to a terminal.
+   Suspension from the command-line has therefore been disabled
+   on Gtk for the time being.
 
 Features:
  * Auto-indention could be implemented via context-sensitive