Doesn't select text further down the document with a mouse when maximised.
A fully maximized window of code can't select text further down the document when dragging to select text.
Expected result: Code scrolls down allowing the user to select the text further down the document until the user raises their mouse from the bottom of the window. (Basically the opposite of what happens when selecting text from a lower area of the document and click+dragging upwards.)
Phrased another way: dragging to select text that is overflowed off the bottom of the window does not automatically scroll the view downward, likely because there's no widget below the SourceView, meaning the cursor is never below the bottom of the SourceView.
Workaround: Scroll the view manually while holding down the primary button.