Gtk+ version requirement to high for Linux Mint 18.3 – error on slides with videos

[complanar]

The file vlcvideo.glade triggers an error because of unsatisfied requirements. Videos could not be played.

Environment

• Linux Mint 18.3
• Python version 3.5

Pympress

• 1.1.2
• Installation method: source

Expected behaviour

No error :-)

Steps to reproduce

With Gtk+ version 3.18 installed pympress throws an error when changing to a slide with video:

Traceback (most recent call last):
  File "/home/teichert/Development/pympress/pympress/ui.py", line 812, in on_navigation
    self.doc.goto_next()
  File "/home/teichert/Development/pympress/pympress/document.py", line 678, in goto_next
    self.goto(self.cur_page + 1)
  File "/home/teichert/Development/pympress/pympress/document.py", line 666, in goto
    self._do_page_change(number)
  File "/home/teichert/Development/pympress/pympress/document.py", line 651, in_do_page_change
    self.page_change()
  File "/home/teichert/Development/pympress/pympress/ui.py", line 706, in on_page_change
    self.medias.replace_media_overlays(self.doc.current_page())
  File "/home/teichert/Development/pympress/pympress/extras.py", line 178, in replace_media_overlays
    v_da_c = vlcvideo.VLCVideo(self.c_overlay, show_controls, relative_margins, get_curryfied_callback)
  File "/home/teichert/Development/pympress/pympress/vlcvideo.py", line 135, in __init__
    self.load_ui('vlcvideo')
  File "/home/teichert/Development/pympress/pympress/builder.py", line 183, in load_ui
    self.add_from_file(util.get_ui_resource_file(resource_name))
GLib.Error: gtk-builder-error-quark: /home/teichert/Development/pympress/pympress/share/xml/vlcvideo.glade:5:1 Required gtk+ version 3.20, current version is 3.18 (7)

Problem

The file pympress/share/xml/vlcvideo.glade reads <requires lib="gtk+" version="3.20"/> at line 4.
I could remove the error by changing to version="3.2" as found in the other glade files.
Everything seemed to worke fine after that.

Is there any specific reason for requiring v 3.20 or was this simply inserted by the development software itself?

[Cimbali]

Definitely a bug, 3.2 is what was intended. I think I fully created the file with Glade so you might be right, it might have been inserted automatically.