Task: Add horizontal scroll bar automatically

[trustin]

When the width of the tree pane is shorter than the actual tree content, a user should be able to scroll the tree horizontally, but it seems like there's neither a horizontal scroll bar nor scrollability, at least in Firefox version of this addon. It'd be nice to have a horizontal scroll bar until #72 is resolved.

[alexmdodge]

@trustin Thanks for the suggestion! I like #72 above having horizontal scroll bars. I toyed with the idea originally but they did make management of the width and vertical vs horizontal scrolling awkward.

Another good feature I thought about was adding the ability to have some configuration so people can decide whether they would like either option. So I think both should hopefully be available in the future.

[trustin]

Another good feature I thought about was adding the ability to have some configuration so people can decide whether they would like either option. So I think both should hopefully be available in the future.

Sure. That sounds great. Another feature I thought about is to provide a way to show/hide the tree panel with a toggle button like ➡️. 😄

[alexmdodge]

Unless I'm misunderstanding, you have that ability right now 😄