[Cin] Perpetual session

[Andrea paz]

I was testing the new git release to test the fps drop with
transitions and the crash with fast reverse.

I also have freeze (not crash) if I use fast reverse. It doesn't
happen every time; it happens more often if transitions are present
and if I use "Perpetual session". No problem in X11, only with
X11-OpenGL.

For me the problem of transitions is solved: there is only a small
drop in fps, but it is instantaneous and immediately restored. The
drop is more accentuated in Reverse, but immediately restored. Even
with "play every frame" I have a more pronounced drop but this is also
immediately restored.

But I noticed that simply putting a transition in timeline leads to
some messages in terminal (Messages that are repeated for each
transition applied). This happens only if "Perpetual session" is
active:

Cinelerra Infinity - built: Sep 13 2020 09:14:25
git://git.cinelerra-gg.org/goodguy/cinelerra.git
(c) 2006-2019 Heroine Virtual Ltd. by Adam Williams
2007-2020 mods for Cinelerra-GG by W.P.Morrow aka goodguy
Cinelerra is free software, covered by the GNU General Public License,
and you are welcome to change it and/or distribute copies of it under
certain conditions. There is absolutely no warranty for Cinelerra.

MainUndo::update_undo_before 92 "": must be on an after entry to do
this. size=39
UndoStack::dump
   0 0x561f28222b70 perpetual load                790 ffffffff *
   1 0x561f28224090 perpetual load                790 ffffffff
   2 0x561f28223450                               882 0000
   3 0x561f2823d0a0 transition                    790 0001
   4 0x561f281fdf40 transition                    524 0001
   5 0x561f281fdee0 transition                    524 0001
   6 0x561f285277a0 transition                    272 0001
   7 0x561f2853f6c0 transition                    272 0001
   8 0x561f28408630 transition                      4 0001
k  9 0x561f283135d0 transition                  11968 0001
  10 0x561f28526680 transition                   1510 0001
  11 0x561f284d4bb0 perpetual load                330 ffffffff
  12 0x561f283e68f0 perpetual load                330 ffffffff
  13 0x561f28312710 record patch                  330 0004
  14 0x561f28431bf0 record patch                  185 0004
  15 0x561f2854de50 record patch                  185 0004
  16 0x561f28551da0 record patch                   52 0004
  17 0x561f28526780 move track down                52 ffffffff
  18 0x561f28456bc0 move track down               174 ffffffff
  19 0x561f28408500 move track up                 174 ffffffff
  20 0x561f28385d30 move track up                  40 ffffffff
  21 0x561f28539df0 move track up                  40 ffffffff
k 22 0x561f284d0ed0 move track up               11874 ffffffff
  23 0x561f28349d80 swap tracks down             1276 ffffffff
k 24 0x561f2a914230 swap tracks down            11874 ffffffff
  25 0x561f2a911f10 swap tracks up               1564 ffffffff
  26 0x561f285299f0 swap tracks up                294 ffffffff
  27 0x561f28391c20 move tracks down              294 ffffffff
  28 0x561f28398b00 move tracks down              464 ffffffff
  29 0x561f282ea000 move tracks up                464 ffffffff
  30 0x561f2a90cc50 move tracks up                294 ffffffff
  31 0x561f2a90a930 record patch                  294 0004
MainUndo::update_undo_after 142 "perpetual load": must be on a before
entry to do this. size=40
UndoStack::dump
   0 0x561f2846e9a0                               790 0000 *
   1 0x561f28222b70 perpetual load                790 ffffffff
   2 0x561f28224090 perpetual load                790 ffffffff
   3 0x561f28223450                               882 0000
   4 0x561f2823d0a0 transition                    790 0001
   5 0x561f281fdf40 transition                    524 0001
   6 0x561f281fdee0 transition                    524 0001
   7 0x561f285277a0 transition                    272 0001
   8 0x561f2853f6c0 transition                    272 0001
   9 0x561f28408630 transition                      4 0001
k 10 0x561f283135d0 transition                  11968 0001
  11 0x561f28526680 transition                   1510 0001
  12 0x561f284d4bb0 perpetual load                330 ffffffff
  13 0x561f283e68f0 perpetual load                330 ffffffff
  14 0x561f28312710 record patch                  330 0004
  15 0x561f28431bf0 record patch                  185 0004
  16 0x561f2854de50 record patch                  185 0004
  17 0x561f28551da0 record patch                   52 0004
  18 0x561f28526780 move track down                52 ffffffff
  19 0x561f28456bc0 move track down               174 ffffffff
  20 0x561f28408500 move track up                 174 ffffffff
  21 0x561f28385d30 move track up                  40 ffffffff
  22 0x561f28539df0 move track up                  40 ffffffff
k 23 0x561f284d0ed0 move track up               11874 ffffffff
  24 0x561f28349d80 swap tracks down             1276 ffffffff
k 25 0x561f2a914230 swap tracks down            11874 ffffffff
  26 0x561f2a911f10 swap tracks up               1564 ffffffff
  27 0x561f285299f0 swap tracks up                294 ffffffff
  28 0x561f28391c20 move tracks down              294 ffffffff
  29 0x561f28398b00 move tracks down              464 ffffffff
  30 0x561f282ea000 move tracks up                464 ffffffff
  31 0x561f2a90cc50 move tracks up                294 ffffffff


Note: I didn't use move/swap tracks up or down! I don't understand why
these entries are present.