Terminal: gtk4prep

[danirabbit]

• Can't subclass scrolledwindow
• Code style
• Can't connect to size_allocate anymore, so just try to scroll on idle
• Add log output to test mode so we can test it

[zeebok]

I am not sure if it is because of the code changes or something else but when I get to the progress view, I see the "I'm faking it!" log message but then the app crashes with

Bail out! Gtk:ERROR:../../../gtk/gtktextview.c:4452:gtk_text_view_validate_onscreen: assertion failed: (priv->onscreen_validated)

[danirabbit]

@zeebok How about now?