terminator separator is transparent

Status changed to 'Confirmed' because the bug affects multiple users.

I can confirm this with Ubuntu's default Ambiance theme. (Not with GTK+'s default Adwaita, though.)

This is typically because of how the theme is drawn.

If you look here: https://bazaar.launchpad.net/~gnome-terminator/terminator/gtk3/files/head:/terminatorlib/themes/

You can see the overrides in place to make Terminator play nice with some themes that do funky things.

But your particular problem /should/ have been fixed by:
https://bazaar.launchpad.net/~gnome-terminator/terminator/gtk3/view/head:/terminatorlib/terminator.py#L454

That should select the background color of your theme, and ensure that the pane handle is drawn with it.

Try attaching a screenshot and let me know what gtk3 theme you use. That might give me more of a clue.

Ah. I didn't see Egmont's follow up comment. More info from you Brian would still be useful.

@Egmont: I assume you too are already on 18.04 LTS like Brian?

Yup, I'm on 18.04 too.

I haven't noticed this bug before, although I use Ambiance, and I fire up terminator every once in a while. So probably it's a regression in 18.04, probably it looked okay in 17.10.

I'm also using Ambiance and I've attached a screenshot but don't think it represents what I actually see in the separator.

Status changed to 'Confirmed' because the bug affects multiple users.

I see this as well on 18.04 when using Ambiance or Radiance themes.

I found these bug reports which seem roughly similar for different software:

https://github.com/gnunn1/tilix/issues/319
https://github.com/gnunn1/tilix/issues/303

Got this bug after upgrading from 16.04 LTS to 18.04 LTS

Same problem here on 18.04. Tried most things on the config side, but without success.

Experiencing the same issue as everyone else with:
Ubuntu : 18.04.1
Terminator : 1.91-1

Same here, Ubuntu 18.4 with Terminator 1.91
This bug is actually quite annoying depending on the window you have behind Terminator.

This bug is present in a fresh install of Ubuntu 18.04.2. As a workaround I changed line 446 in terminator.py to:

        css = """
            .terminator-terminal-window {
                background-color: white}

Which seems to work. Changing .pane-separator didn't work. In fact, changing the pane separator size in settings didn't work at all - it is always fixed at 1 pixel and transparent.

Confirmed that the suggested css workaround does indeed fix the problem. Test case:

$ cat > /tmp/config <<EOF
[layouts]
  [[test]]
    [[[window0]]]
      parent = ""
      type = Window
    [[[child0]]]
      parent = window0
      type = HPaned
    [[[child1]]]
      parent = child0
      type = Terminal
    [[[child2]]]
      parent = child0
      type = Terminal
EOF
### Broken behavior:
$ terminator --no-dbus --config /tmp/config --layout test

### Fixed behavior:
$ sed -i 's/background-color: alpha(@theme_bg_color,0); }/background-color: white; }/' /usr/share/terminator/terminatorlib/terminator.py
$ terminator --no-dbus --config /tmp/config --layout test

The line in question was introduced by rev1672, or probably 1637.1.4 more specifically. "Fix the colours to use public ones, and make Adwaita hover fix consistent." from 2016-12-08.

             .terminator-terminal-window {
- background-color: rgba(0,0,0,0); }
+ background-color: alpha(@theme_bg_color,0); }

I'm curious why it added alpha(...) when the patch didn't do that for other window elements, e.g.:

             .pane-separator {
- background-color: @bg_color; }
+ background-color: @theme_bg_color; }

I notice if instead of changing it to white, I just change it to the theme_bg_color it looks great. I.e., change the sed line from the test case in my previous comment to:

$ sed -i 's/background-color: alpha(@theme_bg_color,0); }/background-color: @theme_bg_color; }/' /usr/share/terminator/terminatorlib/terminator.py

I think removing the "alpha(...)" is the right fix for this bug, unless anyone knows different?

Looks like a better fix has already been suggested here:

https://code.launchpad.net/~tobias-klevenz/terminator/fix-transparent-seprators/+merge/337512