Use system-default fixed font for debug entry and log

aqt/main.py

@@ -1171,6 +1171,10 @@ will be lost. Continue?"""))
         d.silentlyClose = True
         frm = aqt.forms.debug.Ui_Dialog()
         frm.setupUi(d)
+        font = QFontDatabase.systemFont(QFontDatabase.FixedFont)
+        font.setPointSize(frm.text.font().pointSize() + 1)
+        frm.text.setFont(font)
+        frm.log.setFont(font)
         s = self.debugDiagShort = QShortcut(QKeySequence("ctrl+return"), d)
         s.activated.connect(lambda: self.onDebugRet(frm))
         s = self.debugDiagShort = QShortcut(

designer/debug.ui

@@ -41,11 +41,6 @@
        <verstretch>8</verstretch>
       </sizepolicy>
      </property>
-     <property name="font">
-      <font>
-       <family>Courier</family>
-      </font>
-     </property>
      <property name="focusPolicy">
       <enum>Qt::ClickFocus</enum>
      </property>