partially fix scrolling in files > 2 GB

ScaledScrollBar.py

@@ -1,6 +1,7 @@
 import math
 
 from PyQt6.QtWidgets import QScrollBar
+from PyQt6.QtCore import pyqtSignal
 import logging
 
 log = logging.getLogger("scaledScrollBar")
@@ -9,9 +10,18 @@ log = logging.getLogger("scaledScrollBar")
 class ScaledScrollBar(QScrollBar):
     is_huge = False
 
+    valueChanged = pyqtSignal(str)
+    """Signal emitted when the scroll bar value changes. 
+        **Note**: The value is a string and must be parsed into an int. 
+        QT's signal api only supports 32bit integers. Ints larger 
+        than 2**32-1 will overflow. Probably because there is some C/C++
+        code involved. We work around this by converting the python int 
+        into a string."""
+
     def __init__(self):
         super(ScaledScrollBar, self).__init__()
         self.real_maximum = self.maximum()
+        super().valueChanged.connect(self._valueChanged)
 
     def setValue(self, value: int) -> None:
         if self.is_huge:
@@ -34,3 +44,11 @@ class ScaledScrollBar(QScrollBar):
         else:
             self.is_huge = False
             super().setMaximum(maximum)
+
+    def _valueChanged(self, value: int):
+        if self.is_huge:
+            real_value = (value / self.maximum()) * self.real_maximum
+            # print("scaled value changed: %d -> %d (%f)" % (value, real_value, value / self.maximum()))
+            self.valueChanged.emit(str(int(real_value)))
+        else:
+            self.valueChanged.emit(str(int(value)))