this issue affects linux but does not affect windows ... background: if you open enough tabs so that they don't all fit in one screen width, the tab bar becomes scrollable and a dropdown arrow is added all the way to the right. if you continue opening many new tabs such that there are more than can be listed in one screen height in the dropdown, scrolling arrow buttons are added to the top and bottom of the dropdown. if the user opens the dropdown while on the leftmost tab, the top scrolling arrow will be disabled (since there's no farther the user could scroll up), and the bottom scrolling arrow will be enabled. there is a visual indication of each state (the disabled button is faded). the problem: the scrolling arrow buttons' enabled/disabled visual state doesn't get updated as you scroll (it's only updated each time you open the dropdown). so if you're on the leftmost tab and then click the dropdown, then scroll all the way to the bottom, the top scrolling arrow will still show as disabled, while the bottom scrolling arrow will still show as enabled.
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