Operating system or device - Godot version:
Using : Godot_v2.0.2_stable_x11.64 on linuxmint 17.2
auto complete list in code editor is cliping node paths depenging on the last letter written as illustrated below.
get_node("CenterContainer/VBoxContainer/Panel/Button$
|CenterContainer/VBoxContainer/Panel/Button|
|CenterContainer/VBoxContainer/Panel/Button|
|CenterContainer/VBoxContainer/Panel/Button|
|CenterContainer/VBoxContainer/Panel/Button|
|CenterContainer/VBoxContainer/Panel/Button|
|CenterContainer/VBoxContainer/Panel/Button|
It would be better to use biggest next word while listing nodes as below.
get_node("CenterContainer/VBoxContainer/Panel/Button$
|CenterContainer/VBoxContainer/Panel/Button_Up |
|CenterContainer/VBoxContainer/Panel/Button_Down |
|CenterContainer/VBoxContainer/Panel/Button_Aim |
|CenterContainer/VBoxContainer/Panel/ButtonGroup/|
|CenterContainer/VBoxContainer/Panel/ButtonGroup/|
|CenterContainer/VBoxContainer/Panel/ButtonL/Zone|
Not critical for the upcoming 2.1, so moving to the next milestone.
Still happening in 2.1.3

Additionally to original proposal some sort of path shortening may help as well I think.
get_node("CenterContainer/VBox...iner/Panel/Button$
|CenterContainer/VBox...iner/Panel/Button_Up |
|CenterContainer/VBox...iner/Panel/Button_Down |
|CenterContainer/VBox...iner/Panel/Button_Aim |
|CenterContainer/VBox...iner/Panel/ButtonGroup/|
|CenterContainer/VBox...iner/Panel/ButtonGroup/|
|CenterContainer/VBox...iner/Panel/ButtonL/Zone|
May also need a milestone update.
I am not sure if this approach helps much

Is there a reason to use canvasitem and not some Node with horizontal scroll?
Make it configurable?
Both ways seems good and useful but the expertise of the user might be the breaking point to get more on a path than another.
@AlexHolly, do you know if the dots could be on a different color/shading? This could avoid potential confusion.
@silverkorn I looked into the color thing I don't see an easy way for it.
I could probably make the whole line a different color if folding was applied.
Make it configurable?
You mean disable folding? I don't see any benefit.
The folding should only happen when really needed and only as far as needed to fit.
To me this looks like a temporary solution anyway. To solve this issue some horizontal scroll is needed.
@AlexHolly, sorry, I meant the different ways to see the auto-completion list.
But otherwise, indeed, an horizontal scrollbar would be needed. I wasn't aware that all those suggestions were for a workaround.
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Most helpful comment
Still happening in 2.1.3
Additionally to original proposal some sort of path shortening may help as well I think.
May also need a milestone update.