Public bug reported:

I have tried to compare two directories using Meld. Unfortunately it
left comparison panes empty blank, though color markups on the
scrollbars of these panes indicate presence of changes.

Meld writes to stderr a lot of messages like the following about missing
icons in the Adwaita theme:

gi.repository.GLib.Error: gtk-icon-theme-error-quark: Icon 'text-x-generic' not 
present in theme Adwaita (0)
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/ui/emblemcellrenderer.py", line 95, 
in do_render
    pixbuf = self._get_pixbuf(self._icon_name, self._icon_size)
  File "/usr/lib/python3/dist-packages/meld/ui/emblemcellrenderer.py", line 83, 
in _get_pixbuf
    pixbuf = icon_theme.load_icon(name, size, 0).copy()

gi.repository.GLib.Error: gtk-icon-theme-error-quark: Icon 'folder' not present 
in theme Adwaita (0)
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/meld/ui/emblemcellrenderer.py", line 95, 
in do_render
    pixbuf = self._get_pixbuf(self._icon_name, self._icon_size)
  File "/usr/lib/python3/dist-packages/meld/ui/emblemcellrenderer.py", line 83, 
in _get_pixbuf
    pixbuf = icon_theme.load_icon(name, size, 0).copy()

It is expected the meld would show differences on both panes.

Workaround: install adwaita-icon-theme-full package. After installation
the meld works as expected.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: meld 3.20.2-1ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
Uname: Linux 5.4.0-28-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue May  5 13:06:54 2020
InstallationDate: Installed on 2020-04-09 (25 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200408)
PackageArchitecture: all
SourcePackage: meld
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: meld (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Summary changed:

- Meld: comparison panes are left blank with lot of error messages about missed 
icons in Adwata theme
+ Meld: comparison panes are left blank with lot of error messages about missed 
icons in Adwaita theme

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https://bugs.launchpad.net/bugs/1876843

Title:
  Meld: comparison panes are left blank with lot of error messages about
  missed icons in Adwaita theme

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