At Windows, the default display setting is 96 dpi, I set this to 120 dpi. I did not try this at 96 dpi. If the cursor is on the lowest line of the document window, and I want to move down the cursor, the cursor must scroll the window. Sometimes the cursor do nothing: I press the down key, and the all remain unchanged: the cursor position so, and the window does not scroll. If I press some other cursor keys, the error disappears for some minutes.
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