Disable progressbars for individual files

src/tribler-gui/tribler_gui/widgets/downloadsdetailstabwidget.py

@@ -10,7 +10,10 @@
 from tribler_gui.utilities import compose_magnetlink, connect, copy_to_clipboard, format_size, format_speed, tr
 
 INCLUDED_FILES_CHANGE_DELAY = 1000  # milliseconds
-PROGRESS_BAR_DRAW_LIMIT = 1000  # Don't draw progress bars for files in torrents that have more than this many files
+
+# Disabled, because drawing progress bars with setItemWidget is horribly slow on some systems.
+# We must use delegate-based drawing instead
+PROGRESS_BAR_DRAW_LIMIT = 0  # Don't draw progress bars for files in torrents that have more than this many files
 
 
 def convert_to_files_tree_format(download_info):

src/tribler-gui/tribler_gui/widgets/torrentfiletreewidget.py

@@ -107,12 +107,12 @@ def subtree_progress_update(self, updates, force_update=False, draw_progress_bar
                 self.progress_bytes = self.progress_bytes - old_bytes + new_bytes
 
         if child_changed or force_update:
-            if self.file_size and self.progress_bytes:
+            if self.progress_bytes is not None and self.file_size:
                 self.file_progress = self.progress_bytes / self.file_size
                 self.setText(PROGRESS_COL, f"{self.file_progress:.1%}")
 
         # ACHTUNG! This can be _very_ slow for torrents with lots of files, hence disabled by default
-        # To draw progress bars with acceptable performance we'd have to implement use QT's MVC stuff
+        # To draw progress bars with acceptable performance we'd have to use QT's MVC stuff
         if draw_progress_bars:
             bar_container, progress_bar = create_progress_bar_widget()
             progress_bar.setValue(int(self.file_progress * 100))