IDEA menus may appear at an offset

[cavedon]

When using IntelliJ IDEA via Xpra, under some circumstance the menus will appear at an offset (see attached video).

The problem starts happening when doing some action that will cause navigating to a different file in the editor view.
The problem disappears once I move or resize the IDEA window.

The problem is reliably reproducible.
The offset seems to be related to the position of the window on the screen: the further away the main window is from the top left corner of the screen, the greater the offset of the menu is.

In addition to the menus appearing at an offset, it looks like that "some" parts of the window see the mouse pointer at an offset. E.g. resizing panes needs to be done at an offset.

Other observations:

• tested with IDEA 2020.3.4 community edition
• OS is Ubuntu 20.04 on amd64, running gnome-shell- changing window manager to i3 did not help
• disabling scaling (for high resolution monitor) did not help
• it happens in the same whether I am using openjdk 1.11 or 1.14
• when running IDEA in Xvfb and connecting to it via x11vnc, the problem does not happen
• when using ssh with X11 forwarding, the problem does not happen

I cannot rule out it is a Java or IDEA bug, but I was not able to reproduce it without xpra, so I think the debugging should start here.

How can I debug this further?

Video: https://user-images.githubusercontent.com/171046/125608113-741da315-141b-4dbd-9a3f-f2cbe9846cce.mp4

[totaam]

@cavedon I bet it doesn't happen with start-desktop mode either.
Can you please specify the xpra version and commands used?

[cavedon]

Can you please specify the xpra version and commands used?

Oh, of course, sorry for the obvious omission

Version 4.2-r0-1 from xpra deb repo

Server: xpra start :100
Client: xpra attach --opengl=no --pulseaudio=no --min-speed=90 ssh://127.0.0.1/

I bet it doesn't happen with start-desktop mode either.

checking

[cavedon]

I bet it doesn't happen with start-desktop mode either.

Correct. It does not happen in start-desktop mode.

[totaam]

Reproducible on Fedora.

IDEA sends a StackMode configure request (most applications never use this):

do_child_configure_request_event(<X11:ConfigureRequest {'send_event': '0', 'serial': '0x359a', \
    'delivered_to': '0x400010', 'window': '0x180004c', 'x': '0', 'y': '0', 'width': '1390', 'height': '1042', \
   'border_width': '0', 'above': 'None', 'detail': '0', 'value_mask': '64'}>) \
   client=0x180004c, corral=0x400010, value_mask=StackMode, size-hints={'position': (202, 167), 'gravity': 1, 'minimum-size': (340, 0)}
restack above=None, detail=0

And then we were wrongly claiming to have updated the window geometry in the configure notification message we sent back.

Now, we weren't actually changing the window position or size and the window manager is free to do so if it so wishes, so this bug may still exist in IDEA: it looks like they're miscalculating the window's position.

@cavedon you can apply this tiny fix by hand to your installation, use the latest Ubuntu 20.04 packages from the beta repository or wait for the 4.2.2 update.

[stdedos]

Verified as fixed in r29499 - thanks 😀

[cavedon]

Confirming it fixes my issue in 4.2.2, thank you!