Make the autoscroll feature also work for a very short document

nw/gui/doceditor.py

@@ -454,8 +454,9 @@ class GuiDocEditor(QTextEdit):
 
         docChanged = self.docChanged
         if self.mainConf.scrollPastEnd:
+            scrlFac = max(1 - self.mainConf.autoScrollPos*0.01, 0.6)
             docFrame = self.qDocument.rootFrame().frameFormat()
-            docFrame.setBottomMargin(max(0, 0.6*(wH - uM - lM - 4*tB)))
+            docFrame.setBottomMargin(max(0, scrlFac*(wH - uM - lM - 4*tB)))
             self.qDocument.rootFrame().setFrameFormat(docFrame)
 
         # This is needed as the setFrameFormat function itself will
@@ -847,7 +848,7 @@ class GuiDocEditor(QTextEdit):
             if okMod and okKey:
                 cNew = self.cursorRect().center().y()
                 cMov = cNew - cOld
-                mPos = self.mainConf.autoScrollPos * self.viewport().height() * 0.01
+                mPos = self.mainConf.autoScrollPos*0.01 * self.viewport().height()
                 if abs(cMov) > 0 and cOld > mPos:
                     # Move the scroll bar
                     vBar = self.verticalScrollBar()