choose font based on OS

bigtext.py

@@ -1,3 +1,5 @@
+import sys
+
 import math
 import os
 import time
@@ -368,8 +370,8 @@ class InnerBigText(QWidget):
         # print("paintEvent")
         painter = QPainter(self)
         # painter.setFont(self.model.settings.font())
-        # print("%s" %  QFontDatabase.families())
-        # Courier New, DejaVu Sans Mono
+        # Courier New, DejaVu Sans Mono, Monospace, Liberation Mono, Noto Mono, Nimbus Mono L, Tlwg Mono, Ubuntu Mono, FreeMono, Mitra Mono
+        font = "Courier New" if sys.platform == 'win32' or sys.platform == 'cygwin' else "Monospace"
         painter.setFont(QFont("Courier New", self.model.settings.getint_session('general', "font_size")))
         painter.setPen(QColor(0, 0, 0))
         self.update_font_metrics(painter)
@@ -412,7 +414,7 @@ class InnerBigText(QWidget):
         left_offset = int(-1 * self._left_offset * self.char_width)
         y_line_offset = self.char_height;
         for l in self.lines:
-            text = l.line().replace("\t", tab_string)
+            text = l.line()  # .replace("\t", tab_string)
             painter.drawText(left_offset, y_line_offset, text)
             y_line_offset = y_line_offset + self.char_height