Variables pane does not update after changing value via debug console

[karthiknadig]

Issue Type: Bug
VS Code version: Code 1.35.0 (553cfb2, 2019-06-04T01:17:12.481Z)
OS version: Windows_NT x64 10.0.18362

System Info

Item	Value
CPUs	Intel(R) Xeon(R) W-2133 CPU @ 3.60GHz (12 x 3600)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software rasterization: enabled surface_synchronization: enabled_on video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	31.73GB (17.93GB free)
Process Argv
Screen Reader	no
VM	0%

Extensions (6)

Extension	Author (truncated)	Version
python	ms-	2019.5.18875
cpptools	ms-	0.23.1
csharp	ms-	1.19.1
powershell	ms-	2019.5.0
vscode-docker	Pet	0.6.2
code-spell-checker	str	1.7.16

I am from the python extension team. I have investigated this issue on the extension side. The pyhton debug adapter does not get a variables request after a evaluating code via the debug console.

Repro steps:

1. Create a python file with this content:

a = 1
print(a) # set breakpoint here

2. After hitting the breakpoint, open debug console and change the value of a
3. Variables panel is not updated.

Logs from the debug adapter

D00027.812: IDE --> {
                "command": "evaluate",
                "arguments": {
                    "expression": "a=5",
                    "frameId": 2,
                    "context": "repl"
                },
                "type": "request",
                "seq": 15
            }

D00027.828: (while handling {'command': 'evaluate', 'type': 'request', 'seq': 15})
            IDE <-- {
                "type": "response",
                "seq": 20,
                "request_seq": 15,
                "success": true,
                "command": "evaluate",
                "message": "",
                "body": {
                    "result": "",
                    "variablesReference": 0,
                    "presentationHint": {}
                }
            }

D00031.844: IDE --> {
                "command": "disconnect",
                "arguments": {
                    "restart": false
                },
                "type": "request",
                "seq": 16
            }

I have looked at the following issues:
#2399
#15520

we are not doing any variable caching on the debug server.

[isidorn]

Try it out in vscode insiders from Wednsdeay and let us know how it behaves for you.
Due to the node limitation specified #15520 we had to introduce some workaround in the variables view (when a variable is changed in the variables view we do not refresh the whole view).
Though this issue as described here should be fixed now.