Selecting Text Tool causes unexpected font which cannot be changed.

From pinta-1.7.tar.gz.

OpenSUSE Linux Leap 15.2 on Dell 7720 Laptop. 64G.
Running KDE Plasma

DELL7720:~/Downloads/pinta-1.7\> mono --version
Mono JIT compiler version 6.8.0.105 (tarball Tue Jun 9 05:38:43 UTC 2020)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
        TLS: __thread
        SIGSEGV: altstack
        Notifications: epoll
        Architecture: amd64
        Disabled: none
        Misc: softdebug
        Interpreter: yes
        LLVM: supported, not enabled.
        Suspend: hybrid
        GC: sgen (concurrent by default)

configure succeeds. See debuginfo/config.log attached. Also see debuginfo/configure.log (which contains stdout/stderr from configure)

make succeeds. See debuginfo/make.log

make install succeeds. See debuginfo/make-install.log

Steps to reproduce:

1) Execute pinta
2) Select text tool
3) Observe cursor does not turn to text-caret until after a few seconds.
4) Click somewhere on the empty image.
5) Observe nothing seems to happen.
6) Type a few characters.
7) Observe that unexpected characters appear (see debuginfo/*.png) where you typed
8) Observe that the font name combobox changes to a string of unexpected characters
9) Observe that you cannot change the combobox selection (there's only one entry).