groups: add groupbar disable_when_only option

[feelamee]

group:groupbar:disable_when_only

Option allow to hide groupbar if it contains only single window.
This is especially useful with rule:

-- any window will be opened in group
hl.window_rule({ match = { title = ".*" }, group = "set" })

Possible issues

• option was added looking at group:groupbar:enable, but in refreshGroupBarGradients there is no availible active group to properly check option disable_when_only
  I think this check unnecessary here because same scenario already exist when there is no windows with groupbar, but option enabled == true. But unsure - require review.
• new hyprtest is unstable for some reason. Sometimes fail, and sometimes succeed. Maybe this is related to error "(EE) failed to read Wayland events: Broken pipe" which printed in stdout when I launched hyprtest. Anyway, I tested it in practice - launching Hyprland with this patch as single window manager - and feature works well.

Is it ready for merging, or does it need work?

First of all it is need an approve - do we need such feature at all. Then - I tried my best to do this PR as possible as ready for merge. But I'm open for critique and suggestions.

---

wiki PR - hyprwm/hyprland-wiki#1551

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[vaxerski]

tnx

[vaxerski]

your test fails :(

[feelamee]

@vaxerski
look, now I broke groups test too :D
Detailed explanation in commit message, pasting it here to:

groups_disable_when_only test fails because it checks windows sizes after
disable_when_only option changed. Changing option currently don't
trigger window size update.

Same problem with groups test, but it worked because it or:

• didn't checked window size after changing option.
• called hl.dsp.group.toggle(), which trigger size update
• at the begining set enable = 1 while it == 1 by default
  Now it fails too :D

Seems it works in usual Hyprland usage because:

• CHyprGroupBarDecoration::draw calls
• g_pDecorationPositioner->repositionDeco(this),
  which will invalidate cache and update sizes.

So, at first sight we just need to add REFRESH_WINDOW_STATE | REFRESH_LAYOUTS to disable_when_only config option. But it didn't work because in CDecorationPositioner::onWindowUpdate we will go in fast path and return without updating WINDOWDATA->reserved, which will be used in CWindowTarget::updatePos to finally update window size.
Therefore we need to uncacheWindowDecos first. I made ugly fix to prove this here, and this works. But we need something better.

My question:

• maybe we need uncacheWindowDecos when REFRESH_WINDOW_STATE triggered? If no, where we can insert it?
• then we need remove

    if (VISIBLE != m_bLastVisibilityStatus)
        g_pDecorationPositioner->repositionDeco(this);

from CHyprGroupBarDecoration::draw?

• and also add REFRESH_WINDOW_STATE | REFRESH_LAYOUTS to group:groupbar:enabled config option?

[vaxerski]

you can call hyprctl reload probably then sync. Should work.

doh, you mean live. Yes, uncaching when window state changes is ok.

[vaxerski]

clang-format please

[feelamee]

@vaxerski, I fixed formatting. Any other suggestions? Or we can merge.
P.S. sorry for mentioning, is it ok to remind about PR here?