Filezilla gives critical messages in the console while starting: IA__gtk_widget_set_size_request

[Markus Grob]

I have downloaded FileZilla because I haven't found in in the repositories (3.16.1).
While starting from the console, I get the following lines, but in the GUI, I don't see an error:

markus@linux-vrvl:~/Downloads/FileZilla3/bin> ./filezilla

(filezilla:7978): Gtk-WARNING : Theme directory of theme oxygen has no size field

(filezilla:7978): Gtk-CRITICAL : IAgtk_widget_set_size_request: assertion 'height >= -1' failed

(filezilla:7978): Gtk-CRITICAL : IAgtk_widget_set_size_request: assertion 'width >= -1' failed

(filezilla:7978): Gtk-CRITICAL : IAgtk_widget_set_size_request: assertion 'height >= -1' failed

(filezilla:7978): Gtk-CRITICAL : IAgtk_widget_set_size_request: assertion 'width >= -1' failed

(filezilla:7978): Gtk-CRITICAL : IAgtk_widget_set_size_request: assertion 'height >= -1' failed

(filezilla:7978): Gtk-CRITICAL : IAgtk_widget_set_size_request: assertion 'width >= -1' failed

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I have seen, that there is only one bug open with similiar behavier, but in an other context: ​https://trac.filezilla-project.org/ticket/9927

I have downloaded the package (FileZilla_3.16.1_x86_64-linux-gnu.tar.bz2 from sourceforge). Then I have unzipped it and started the binary as normal user in a subfolder of my homedirectory.

The package is linked against wxWidgets 3.0.3 and I'm using KDE Plasma 5.5.5

[Tim Kosse]

These messages come from GTK+ and could be caused either by GTK+ itself, the theming engine you are using or the wxWidgets toolkit.

In any case, it's not caused by FileZilla and, despite being labeled "CRITICAL", nothing bad happens. The program does not even terminate as one would expect from a critical error.