Line numbers invisible after Zen Mode toggled off

[10bo]

• VSCode Version: 1.41.1 (user setup)
• OS Version: Windows_NT x64 10.0.18362

Steps to Reproduce:

1. Ensure you have at least one file open in editor
2. Enable Zen Mode
3. Click on a file in the Source Control tab under the CHANGES sub-heading to open the side-by-side diff
4. Disable Zen Mode
5. Click on the tab for the file opened in step 1 & observe the area where line numbers should appear

Does this issue occur when all extensions are disabled?: Yes

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• Line Numbers Dissapear After Exiting Zen Mode (#86365)
• Expose in the API whether Zen Mode is enabled (#89278)
• Zen mode restore setting restores only full-screen (#44652)
• Web: Zen mode and refresh is stuck in centered layout (#82597)
• Zen mode remove top bar (#30567)

[isidorn]

I acknowledge this issue.
The problem is how we reset the line numbers after exiting zen mode
Code pointer

vscode/src/vs/workbench/browser/layout.ts

Line 780 in 8d17dc1

setLineNumbers();

An elegant PR that fixes this is welcome.
We might also look into this in the future.

[jeanp413]

@isidorn I took a look at this and to fix this we need not just the visibleTextEditorWidgets but the non-visible ones too. I looked around and it seems there is no method for this in IEditorService or IEditorGroupsService
There is an array in EditorControl that holds the visible and non-visible editors, would it be fine to expose this variable ?

vscode/src/vs/workbench/browser/parts/editor/editorControl.ts

Line 39 in 2175713

private controls: BaseEditor[] = [];

[isidorn]

@jeanp413 thanks for looking into this. That sounds reasonable. However let's check with @bpasero if he wants to expose non visible editors in the editorService or if he has a better suggestion for this.

Alternative would be to remember all the editors that we have hidden line numbers for, and then when bringing them back to go through those editors.

[bpasero]

@isidorn IEditorService#editors gives access to all opened editors.

[isidorn]

Ok thanks. @jeanp413 so that + .getControl() should probably give you all the editorWidgets.

[jeanp413]

IEditorService#editors gives an array of IEditorInput which doesn't have a .getControl() method.
Is there a way to get a BaseEditor from an IEditorInput?

[isidorn]

I believe the Editor control only exists for the visible editors (thus we create just one editor per Group). To save on resources.
So I believe the correct way to fix this is to remember all the editors that we have hidden line numbers for, and then when bringing them back to go through those editors.

@bpasero can correct me if I am wrong. Thansk

[bpasero]

Yes, for performance reasons we only allocate 1 editor control per visible tab, not for each tab that is hidden.

[jeanp413]

I pushed 2 branches with different fixes for this issue

1. https://github.com/jeanp413/vscode/tree/zen-mode-linenumbers-1
   This branch fixes it by using a Set to remember all the editor we have hidden line numbers as isidorn suggested. Not sure if it's safe to call updateOptions on disposed editor widgets (this could happen if we have multiple editor groups and we close any of them)
2. https://github.com/jeanp413/vscode/tree/zen-mode-linenumbers-2
   This branch fixes it by exposing the controls array in EditorControl and updating the IEditorGroup and IEditorService interfaces

@isidorn let me know which approach is preferred to create the corresponding PR