I get this ominous - but strangely non-blocking - error in the console, and only after keyboard input (any input, like Alt-tab to switch windows)
Gtk-CRITICAL **: 21:17:36.536: gtk_css_node_insert_after: assertion 'previous_sibling == NULL || previous_sibling->parent == parent' failed
I managed to trace it (no line # or context, that’s harsh) back to the building of a - prototype - Gtk.TreeView:
self.button_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL)
self.prev_button = Gtk.Button(label="Prev")
self.pause_button = Gtk.Button(label="Pause")
self.next_button = Gtk.Button(label="Next")
self.main_paned = Gtk.Paned(orientation=Gtk.Orientation.VERTICAL)
self.playlist = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL)
self.main_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
self.video = Gtk.Video()
self.list_store = Gtk.ListStore(int, str)
self.playlist_tree_view = Gtk.TreeView(model=self.list_store)
self.playlist_sw = Gtk.ScrolledWindow()
#Playlist logic
def convert(list):
return tuple(list)
self.playList = []
if os.path.exists("playlist.txt"):
with open("playlist.txt") as f:
lines = [line.rstrip() for line in f]
for i in range(len(lines)):
self.playList.append(convert([i, lines[i]]))
for video in self.playList:
self.list_store.append(list(video))
for i, col_title in enumerate(["Num", "Uri"]):
renderer = Gtk.CellRendererText()
column = Gtk.TreeViewColumn(col_title, renderer, text=i)
self.playlist_tree_view.append_column(column)
# /Playlist
self.button_box = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL)
self.prev_button = Gtk.Button(label="Prev")
self.pause_button = Gtk.Button(label="Pause")
self.next_button = Gtk.Button(label="Next")
self.main_paned = Gtk.Paned(orientation=Gtk.Orientation.VERTICAL)
self.playlist = Gtk.Box(orientation=Gtk.Orientation.HORIZONTAL)
self.main_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
self.video = Gtk.Video()
self.list_store = Gtk.ListStore(int, str)
self.playlist_tree_view = Gtk.TreeView(model=self.list_store)
self.playlist_sw = Gtk.ScrolledWindow()
#Playlist logic
def convert(list):
return tuple(list)
self.playList = []
if os.path.exists("playlist.txt"):
with open("playlist.txt") as f:
lines = [line.rstrip() for line in f]
for i in range(len(lines)):
self.playList.append(convert([i, lines[i]]))
for video in self.playList:
self.list_store.append(list(video))
for i, col_title in enumerate(["Num", "Uri"]):
renderer = Gtk.CellRendererText()
column = Gtk.TreeViewColumn(col_title, renderer, text=i)
self.playlist_tree_view.append_column(column)
# /Playlist
self.playlist_sw.set_child(self.playlist_tree_view)
self.button_box.append(self.prev_button)
self.button_box.append(self.pause_button)
self.button_box.append(self.next_button)
self.main_paned.set_start_child(self.video)
self.main_paned.set_end_child(self.playlist_sw)
self.main_box.append(self.main_paned)
self.main_box.append(self.button_box)
self.set_child(self.main_box)
If I remove the self.playlist_tree_view.append_column(column) the error doesn’t occur, so I must be doing something wrong in the building of my TreeView…? I noticed a “search” widget that pops up when I type over the view, could this be causing this error? Note that the App behaves exactly like it should, but I need to understand what is going on here. I tried various container strategies, but it always comes down to this append_column.
NB I’m still stuck on a small ARM machine, where I can’t install (and boy did I try) Builder / Workbench which hopefully has introspection capabilities that could help me visualize the, hum, DOM? But in the meantime it’s really shots in the dark.
EDIT: So yes, apparently the problem is the small bubble that pops up when you enter text (which is very handly, and it works BTW, it does fuzzy-search the listview, very handy & powerful) but I must be doing something wrong container-wise, does this error on “popups” ring a bell to anyone?