Fix custom nodes not responding to changed widget values

[webfiltered]

Resolves Comfy-Org/ComfyUI_frontend#1627

Logic for onWidgetChanged callback refactored to work in CanvasPointer callbacks.

[LukeG89]

@webfiltered I don't know which commit introduced this little bug, but in 1.4.7 doesn't happen.
Everytime I pass the mouse over these path widgets, they open like I double-click them.

Path.mp4

Debug logs:

E:\>.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build --preview-size 1024 --front-end-version Comfy-Org/ComfyUI_frontend@latest
[START] Security scan
[DONE] Security scan
## ComfyUI-Manager: installing dependencies done.
** ComfyUI startup time: 2024-11-23 14:32:49.472348
** Platform: Windows
** Python version: 3.11.9 (tags/v3.11.9:de54cf5, Apr  2 2024, 10:12:12) [MSC v.1938 64 bit (AMD64)]
** Python executable: E:\python_embeded\python.exe
** ComfyUI Path: E:\ComfyUI
** Log path: E:\comfyui.log

Prestartup times for custom nodes:
   1.2 seconds: E:\ComfyUI\custom_nodes\ComfyUI-Manager

Total VRAM 8192 MB, total RAM 65277 MB
pytorch version: 2.6.0.dev20241115+cu124
Set vram state to: NORMAL_VRAM
Device: cuda:0 NVIDIA GeForce RTX 3070 Ti Laptop GPU : cudaMallocAsync
Using pytorch cross attention
Initializing frontend: Comfy-Org/ComfyUI_frontend@latest, requesting version details from GitHub...
[Prompt Server] web root: E:\ComfyUI\web_custom_versions\Comfy-Org_ComfyUI_frontend\1.4.8
### Loading: ComfyUI-Impact-Pack (V7.11.5)
### Loading: ComfyUI-Impact-Pack (Subpack: V0.8)
[Impact Pack] Wildcards loading done.
### Loading: ComfyUI-Inspire-Pack (V1.7)
### Loading: ComfyUI-Manager (V2.51.9)
### ComfyUI Revision: 2855 [839ed336] | Released on '2024-11-22'
[comfyui_controlnet_aux] | INFO -> Using ckpts path: E:\ComfyUI\custom_nodes\comfyui_controlnet_aux\ckpts
[comfyui_controlnet_aux] | INFO -> Using symlinks: False
[comfyui_controlnet_aux] | INFO -> Using ort providers: ['CUDAExecutionProvider', 'DirectMLExecutionProvider', 'OpenVINOExecutionProvider', 'ROCMExecutionProvider', 'CPUExecutionProvider', 'CoreMLExecutionProvider']
[ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/alter-list.json
[ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/extension-node-map.json
[ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/github-stats.json
DWPose: Onnxruntime with acceleration providers detected
[ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/model-list.json
[ComfyUI-Manager] default cache updated: https://raw.githubusercontent.com/ltdrdata/ComfyUI-Manager/main/custom-node-list.json
WAS Node Suite: OpenCV Python FFMPEG support is enabled
WAS Node Suite: `ffmpeg_bin_path` is set to: /ffmpeg/bin
WAS Node Suite: Finished. Loaded 218 nodes successfully.

        "The secret to getting ahead is getting started." - Mark Twain


Import times for custom nodes:
   0.0 seconds: E:\ComfyUI\custom_nodes\loadImageWithSubfolders.py
   0.0 seconds: E:\ComfyUI\custom_nodes\websocket_image_save.py
   0.0 seconds: E:\ComfyUI\custom_nodes\stability-ComfyUI-nodes
   0.0 seconds: E:\ComfyUI\custom_nodes\ComfyUI_experiments
   0.0 seconds: E:\ComfyUI\custom_nodes\ComfyUI_IPAdapter_plus
   0.0 seconds: E:\ComfyUI\custom_nodes\ComfyUI_essentials
   0.0 seconds: E:\ComfyUI\custom_nodes\ComfyUI-Inspire-Pack
   0.1 seconds: E:\ComfyUI\custom_nodes\ComfyUI-VideoHelperSuite
   0.1 seconds: E:\ComfyUI\custom_nodes\comfyui_controlnet_aux
   0.3 seconds: E:\ComfyUI\custom_nodes\ComfyUI-Manager
   0.4 seconds: E:\ComfyUI\custom_nodes\ComfyUI-Impact-Pack
   1.1 seconds: E:\ComfyUI\custom_nodes\was-node-suite-comfyui

Starting server

To see the GUI go to: http://127.0.0.1:8188

[webfiltered]

Cheers! Would not have found that one organically - I use the upload node in places.