[Cin] Clips/Nested clips/Xml - new feature - best thing since sliced bread!

[Phyllis Smith]

With the latest checkin, you can now edit EDL that is included with your
project as Clips, Nested Clips, or Xml.  For example, if you have a nested
clip that originally had several plugins added to it before it was nested,
you can edit those plugin parameter values.  Previously to make any changes
to these EDL clips/nested clips, you had to remake the whole clip from
scratch.  This is done via "Open EDL" and button click as described below
by the ****.

In addition a couple of modifications related to this are noticeable to
include the following:
  - in the Clip folder, when you Nest a clip, the wording which was "Nest"
is now "Nest to Media"
  - in the Clip folder, when you actually perform "Nest to Media", the
nested clip is only displayed in the Media folder

for example:
1) load some test media, mode replace project
2) highlight a selection and press create clip.  add notes and press ok.
clip is created
3) in resources window, open the clip folder.  clip1 is present
4) select clip1 and right mouse the item.  select menu item Open EDL
5) timeline changes to just the clip content.
6) add a visible effect, like burning tv and press the [1] in the main menu
bar.
7) timeline is restored to original media.
8) drag the clip from the resources folder to the timeline.  The effect is
visible.

**** - in the Clip folder, there is a new option to "Open EDL" for the
highlighted clip.  When you choose this option, the clip will be brought up
on the timeline.  *VERY IMPORTANT to note*, the previous timeline EDL is
"pushed onto a stack" (this is programmer talk) so it is remembered and to
get back to that you have to "pop the stack" (more programmer talk) by
clicking on the button in the upper right hand corner of the timeline above
where the Proxy switch button would be.  Usually this button will read 1 if
you choose "Open EDL" and then 0 when back to your original timeline.  You
can go several levels deep so instead of 1, it could be 2, 3, ... but I got
to tell you that you can get lost if you overdo it.  Once the clip is open
on the timeline, you can edit it however you want.

  - in the Media folder, once you have nested a clip, the Nested clip will
be located here
  - in the Media folder, the option to unnest the clip is now called "EDL
to clip" which results in the nested clip being reverted to a clip and back
into the clip folder with only a name of "Clip #".  The nested clip is also
still in the Media folder.
  - in the Media folder, you now have the new option to "Open EDL" as
described for clips above.  But in this case when you Open EDL and edit the
changes, those changes will take affect on any and all occurrences of that
nested clip on the timeline.

I will make a demo later.  There are Debian 9/10 static tars that contain
this and other mods in the Download / Documentation / File Storage at
cinelerra-gg.org.  Would be happy to make static tars for any other usual
distro/version if you would like to test early.
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