snippet suggestion does not appear when use specific prefixes

[almaceleste]

Issue Type: Bug

1. add to the ~/.config/Code/User/snippets/r.json file:

    "assignment operator": {
       "prefix": ["<-", "="],
       "body": [
           "<- "
       ],
       "description": "assignment operator"
   },
   "magrittr pipe": {
       "prefix": ["%>%", ">"],
       "body": [
           "%>%",
           "\t$0"
       ],
       "description": "magrittr pipe"
   }

2. open .r file and type <, = or > - snippet suggestion does not appear, but if press Ctrl+Space it is in the dropdown list.
3. type - or % and snippet suggestion appears automatically, without Ctrl+Space.

note: strange, that for javascript.json prefix < works, but > does not.

VS Code version: Code 1.50.1 (d2e414d9e4239a252d1ab117bd7067f125afd80a, 2020-10-13T14:44:48.716Z) OS version: Linux x64 5.4.0-52-lowlatency

System Info

|Item|Value| |---|---| |CPUs|Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz (12 x 3200)| |GPU Status|2d_canvas: enabled
flash_3d: enabled
flash_stage3d: enabled
flash_stage3d_baseline: enabled
gpu_compositing: enabled
multiple_raster_threads: enabled_on
oop_rasterization: disabled_off
opengl: enabled_on
protected_video_decode: unavailable_off
rasterization: disabled_software
skia_renderer: enabled_on
video_decode: unavailable_off
vulkan: disabled_off
webgl: enabled
webgl2: enabled| |Load (avg)|1, 1, 0| |Memory (System)|15.57GB (1.65GB free)| |Process Argv|--no-sandbox --crash-reporter-id 0bfd8309-f876-4390-99c3-dddd9b122049| |Screen Reader|no| |VM|0%| |DESKTOP_SESSION|xfce| |XDG_CURRENT_DESKTOP|XFCE| |XDG_SESSION_DESKTOP|xfce| |XDG_SESSION_TYPE|x11|

Extensions (47)

Extension|Author (truncated)|Version ---|---|--- vscode-browser-preview|auc|0.6.7 unique-lines|bib|1.0.0 file-properties-viewer|bru|0.5.0 npm-intellisense|chr|1.3.1 regex|chr|0.2.0 vscode-translate|chu|0.1.5 vscode-quick-select|dba|0.2.9 apt-source-list-syntax|dei|0.1.5 gitlens|eam|10.2.2 vscode-npm-script|eg2|0.3.13 auto-close-tag|for|0.5.9 auto-rename-tag|for|0.1.5 code-runner|for|0.11.1 shell-format|fox|7.0.1 seito-openfile|Fr4|1.8.7 vscode-pull-request-github|Git|0.20.1 shortcuts|giz|0.0.1 name-that-color|gui|0.1.2 rest-client|hum|0.24.3 r|Iku|1.5.2 reg|ion|1.0.1 AWK|lug|0.0.2 python|ms-|2020.10.332292344 cpptools|ms-|1.0.1 powershell|ms-|2020.6.0 vscode-github-issue-notebooks|ms-|0.0.57 debugger-for-chrome|msj|4.12.11 reload|nat|0.0.6 linesinfostatusbar|pet|0.0.3 vscode-css-peek|pra|4.0.0 bracketeer|pus|1.3.1 vscode-data-preview|Ran|2.2.0 r-lsp|REd|0.1.11 LiveServer|rit|5.6.1 color-manager|roy|0.6.1 csspreview|san|1.0.4 trailing-spaces|sha|0.3.1 vscode-scheme|sjh|0.4.0 code-spell-checker|str|1.9.2 code-spell-checker-russian|str|0.2.8 code-spell-checker-spanish|str|1.0.6 open-in-new-instance|syd|1.2.1 open-window-tab-context|tak|1.4.2 pdf|tom|1.1.0 autocomplate-shell|tru|0.1.1 vscodeintellicode|Vis|1.2.10 open-in-external-app|YuT|0.2.1

[vscodebot[bot]]

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

• [json] don't suggest top level snippet if there's already an object (#53454)

[jrieken]

Yes - quick suggestions (suggestions as you type) only appear when typing at word ends not when typing arbitrary characters. This is done to prevent unwanted showings of the suggest widget

[almaceleste]

as-designed?! really?!! javascript file (just pressed <, not pressed ctrl+space): r file (just pressed <): r file (pressed ctrl+space): are these different behaviors really intended from by design?!! why?!!

[jrieken]

why?!!

because < is a trigger character for JS

[almaceleste]

because < is a trigger character for JS

trigger to what? I can create snippets for trigger characters only? if so, where can I see the entire list of trigger symbols?