App main dialog not visible/behind other windows on Linux Xfwm4

[haarp]

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The app's main dialog (the one that appears when clicking on the tray icon) is often not visible when another window (e.g. Firefox) is at the same location and focused. The dialog spawns behind the other window. The window manager (Xfwm4 from the Xfce project) has a focus stealing prevention mechanism which is relevant here. I've never seen this happen with any other app, so Nextcloud seems to be at fault here.

The fix is easy, the main dialog (and only the main dialog) should spawn with the "Always on top" setting.

Until then, as a workaround, I have added this rule to my devilspie2 config:

if ( get_application_name()=="Nextcloud" ) then
	set_window_above();
end

Expected behaviour

Dialog always visible

Actual behaviour

Dialog hidden by other windows

Steps to reproduce

1. Use Xfwm4 as window manager (tested w/ v4.16.1)
2. In Window Manager Tweaks, activate "Acctivate focus stealing prevention"
3. Maximize and focus a Firefox window
4. Click the Nextcloud tray icon
5. -> Nextcloud dialog invisible, behind the Firefox window
6. Click tray icon two more times
7. Dialog disappears, reappears, is visible now

Client configuration

Client version: 3.1.3

Operating system: Gentoo Linux, Xfce4

OS language: English

Qt version used by client package (Linux only, see also Settings dialog): 5.15.2

Client package (From Nextcloud or distro) (Linux only): Distro

Thanks!

[brtptrs]

Testing 3.4 (3.3.81) from the Ubuntu alpha ppa:
The "main dialogue" does not show at all
Clicking on the system tray shows the options as expected and selecting the different options works, except when clicking on "Open main dialog", here nothing happens.

Ubuntu 20.04
NC 3.4.0-20211124.120120.f575cc186-1.0~focal1
Using the default Ubuntu X11 window manager

[haarp]

Yes, it seems even with the Devilspie always-on-top workaround, the dialog very often remains invisible. So something else must be bugged in addition.

Curiously, tooltips are shown on the invisible dialog.

[janvlug]

This issue seems to be related to the fact that the Main window is not a regular window. This causes several issues in Linux distributions (I am using Fedora 35 with GNOME on Wayland, and the Nextcloud client Main window has not been working properly for a long time). See also:

• Turn main dialog into regular dialog #2649 (comment)
• System tray doesn't initialise properly on Ubuntu 20.04 #1977 (comment)

[haarp]

I'm closing this as a duplicate of #4017, which has many more upvotes, even though this issue was first.