dropdown sometimes shows up leftmost in the toolbar

[parmentelat]

observed on rare occasions, mostly with multiple notebooks open

the symptom is the dropdown button <-> does get created but it show up at the left end of the toolbar,
before the diskette icon

any clue as to how to reproduce reliably would be helpful

[firezym]

@parmentelat Sure, I will pay attention to it.
I think probably it is about this line of code: notebookPanel.toolbar.insertItem(10, 'cellWidth', button)
The first param is the order of this widget. But I am not sure how official button is the toolbar button's orders are organized. If I place index as 11 or bigger, the button will appear at the right side before the debug button. It is not very intuitive for me to under stand the order index as number.

[firezym]

Do you notice that debug button also jumps around when switching and refreshing between 2 different notebooks?

[firezym]

I can not now reproducing my dropdown button <-> 's jumping around left or right. But my debug button is behaving what you said in this issue lol...

[parmentelat]

I think probably it is about this line of code: notebookPanel.toolbar.insertItem(10, 'cellWidth', button)

my understanding is the toolbar is defined here:
https://github.com/jupyterlab/jupyterlab/blob/main/packages/notebook-extension/schema/panel.json#L4-L37

I believe that inserting with a rank (in our case 50 sounds about right) would ensure a correct placement, but I can't seem to find an API call that accepts a rank; there is insertAfter however, that maybe could help out
https://jupyterlab.readthedocs.io/en/latest/api/classes/ui_components.Toolbar-1.html#insertAfter

another totally different option would be to define the whole button/submenu in our plugin.json rather than in code, it seems more in line with what current practices are tending towards, but I am not exactly 100% comfy with that yet :)

---

just to understand where we are now, is version 0.2.1 workable for daily work for you ?

also please make sure to mention which version you are using when you post an observation, esp. when things change as fast as they these days ;-)

[firezym]

@parmentelat Sure, I will mention the version or sync the codes before test :)
The version 0.2.1 is working well for my daily work now :)
I learned a lot from your code changes :) Thanks a lot!

[firezym]

I submitted an issue in the jupyterlab official repo about the button order. There is improvement in 4.1.0a3, but still slight chance of disorder...

jupyterlab/jupyterlab#15509