Support `edit()` similar to RStudio

System details:

Positron and OS details:

version: Positron Version: 2025.06.0 (system setup) build 167
Code - OSS Version: 1.100.0
Commit: e7e5d5590adc6bf7b760f837051cd2f57ea9e3dc
Date: 2025-05-29T21:27:54.586Z
Commit: 34.5.1
Date: 132.0.6834.210
Electron: 20.19.0
ElectronBuildId: 13.2.152.41-electron.0
Chromium: Windows_NT x64 10.0.19045

Describe the issue:

R 4.2.3 Seurat 5.1.0

When I try to modify Seurat's internal functions using edit.

DoHeatmap1 <- edit(Seurat::DoHeatmap())
Error in DefaultAssay():
! argument "object" is missing, with no default
Hide Traceback
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1. ├─utils::edit(Seurat::DoHeatmap())
2. └─Seurat::DoHeatmap()
3. ├─assay %||% DefaultAssay(object = object)
4. └─SeuratObject::DefaultAssay(object = object)

Even if I directly copy the DoHeatmap function content and reassign it to DoHeatmap1, it still doesn't work like in RStudio and throws an error.

Error in Melt():
! could not find function "Melt"
Hide Traceback
▆

1. └─global DoHeatmap1(...)
2. └─global SingleRasterMap1(...)

Expected or desired behavior:

Please provide F2 and edit functionality similar to RStudio, or if it already exists, please let me know where to find it.

Start by reproducing the reported workflow with R 4.2.3 and the Seurat DoHeatmap example, then inspect Positron's existing F2 and edit command entry points. Compare the behavior with RStudio, including editing a function definition and reassigning it, and define done as documented or working edit functionality that handles the reported cases.