I have implemented a fix that makes the scrollbars behave like they do
in VScode. Vertically you can scroll past the end of the file until only
the last line can be seen at the top. The horizontal bar behaves as if
every line was the same length which is the length of the longest line
in the file. Not only this creates a better user experience, but it also
fixes the annoying flicker that occurs when scrolling through large
files. Also, I have switched all the old draw calls to render text to
regular TextUnformatted calls which adds extra stability to the
resulting display.
To implement the behavior I added a dummy widget with the desired
dimensions.
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