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Edit: I have just realized, the same resizing happens if I maximize a window and then restore it, but only in nautilus, and not in evince/gedit.

Ever since I started using Bionic, I've had the following issue with two desktops connected to HiDPI monitors (3840x2160), at work and at home: if I lock the screen and step away for some time, when I get back some windows are resized/shrinked.

It happens for applications like Nautilus and Evince, but not for others like Firefox or Texmaker. See before:

and after:

Subsequent lock and login cycles shrink the windows further, so that if I'd forgotten an open folder in the morning, by next day Nautilus opens by default to a really small window.

I did some Googling (Ask Ubuntu Question 1, Ask Ubuntu Question 2, Ask Ubuntu Answer, Launchpad bug) and it seems like maybe the culprit is the fact that I use 200% scaling and the login screen. But nothing I tried solved the issue. Is there anything I can do to debug this issue further?

I tried the solutions in Ask Ubuntu Question 1, to set Gnome's automatic window scaling the match what I use by:

$ gsettings set org.gnome.desktop.interface scaling-factor 2

but that didn't work.

I also tried to scale gdm3's login screen so that it matches my desktop as described in Ask Ubuntu Question 2, by editing /usr/share/glib-2.0/schemas/org.gnome.desktop.interface.gschema.xml so that the scaling-factor key reads:

<key name="scaling-factor" type="u">
 <default>2</default>
 <summary>Window scaling factor</summary>
 <description>
 Integer factor used to scale windows by. For use on high-dpi screens.
 0 means pick automatically based on monitor.
 </description>
</key>

and like the second answer suggested creating /usr/share/glib-2.0/schemas/93_hidpi.gschema.override with content

[org.gnome.desktop.interface]
scaling-factor=2

then running

$ sudo glib-compile-schemas /usr/share/glib-2.0/schemas

and that didn't work either.

Finally, trying to make sure gdm3's login screen uses the same resolution as my desktop, I followed this Ask Ubuntu Answer and ran

$ sudo cp -i .config/monitors.xml /var/lib/gdm3/.config/
$ sudo dpkg-reconfigure gdm3

still, no joy. (I'll paste my monitors.xml below, just in case that could help.)

<monitors version="2">
 <configuration>
 <logicalmonitor>
 <x>0</x>
 <y>0</y>
 <scale>2</scale>
 <primary>yes</primary>
 <monitor>
 <monitorspec>
 <connector>DP-2</connector>
 <vendor>DEL</vendor>
 <product>DELL S2817Q</product>
 <serial>J42MC89E181I</serial>
 </monitorspec>
 <mode>
 <width>3840</width>
 <height>2160</height>
 <rate>59.997123718261719</rate>
 </mode>
 </monitor>
 </logicalmonitor>
 </configuration>
</monitors>