Icon's visual preview is not displayed on vscode

[canisterism]

Hi, I really like this tool and thank you committers to create such great tool.
Here I report unexpected behavior and want to ask if I did something wrong or it's not supported on vscode.

Environment

$ flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, v1.12.13+hotfix.5, on Mac OS X 10.14.5 18F132, locale en-JP)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
[✓] Android Studio (version 3.5)
[✓] VS Code (version 1.43.2)
[✓] Connected device (1 available)

• No issues found!

Steps to reproduce

Here's config.json to reproduce.

config.json (sorry it's plain text)

{
"name": "SputnikIcon",
"css_prefix_text": "",
"css_use_suffix": false,
"hinting": true,
"units_per_em": 1000,
"ascent": 850,
"glyphs": [
{
"uid": "abe5a8ddf0f76bf7855f962175a71c6d",
"css": "store",
"code": 59393,
"src": "material"
},
{
"uid": "9548f8adbc5e7b2dc94633be2821cd1f",
"css": "access_alarm",
"code": 59392,
"src": "material"
},
{
"uid": "3ce1fccd5d6b1657c55370d653e0abaa",
"css": "email-outline",
"code": 59403,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M791.7 166.7H208.3A125 125 0 0 0 83.3 291.7V708.3A125 125 0 0 0 208.3 833.3H791.7A125 125 0 0 0 916.7 708.3V291.7A125 125 0 0 0 791.7 166.7ZM763.7 250L500 447.9 236.2 250ZM791.7 750H208.3A41.7 41.7 0 0 1 166.7 708.3V302.1L475 533.3A41.7 41.7 0 0 0 500 541.7 41.7 41.7 0 0 0 525 533.3L833.3 302.1V708.3A41.7 41.7 0 0 1 791.7 750Z",
"width": 1000
},
"search": [
"email-outline"
]
},
{
"uid": "19ab45f78c20d281fc8a13d91b196f32",
"css": "log-in-outline",
"code": 59414,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M791.7 166.7H708.3A41.7 41.7 0 0 0 708.3 250H750V750H708.3A41.7 41.7 0 0 0 708.3 833.3H791.7A41.7 41.7 0 0 0 833.3 791.7V208.3A41.7 41.7 0 0 0 791.7 166.7ZM491.7 308.3A41.7 41.7 0 0 0 425 358.3L500 458.3H166.7A41.7 41.7 0 0 0 166.7 541.7H503.7L432.1 643.3A41.7 41.7 0 0 0 442.1 701.7 41.7 41.7 0 0 0 466.2 709.2 41.7 41.7 0 0 0 500 691.7L617.5 525A41.7 41.7 0 0 0 617.5 475.8Z",
"width": 1000
},
"search": [
"log-in-outline"
]
},
{
"uid": "968b5bceab44c942f326b7db63215e19",
"css": "lock-outline",
"code": 59413,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M708.3 333.3H666.7V254.6A166.7 166.7 0 1 0 333.3 254.6V333.3H291.7A125 125 0 0 0 166.7 458.3V791.7A125 125 0 0 0 291.7 916.7H708.3A125 125 0 0 0 833.3 791.7V458.3A125 125 0 0 0 708.3 333.3ZM416.7 254.6A85.8 85.8 0 0 1 500 166.7 85.8 85.8 0 0 1 583.3 254.6V333.3H416.7ZM750 791.7A41.7 41.7 0 0 1 708.3 833.3H291.7A41.7 41.7 0 0 1 250 791.7V458.3A41.7 41.7 0 0 1 291.7 416.7H708.3A41.7 41.7 0 0 1 750 458.3ZM500 500A125 125 0 1 0 625 625 125 125 0 0 0 500 500ZM500 666.7A41.7 41.7 0 1 1 541.7 625 41.7 41.7 0 0 1 500 666.7Z",
"width": 1000
},
"search": [
"lock-outline"
]
},
{
"uid": "06c992f21a9dfd081c9321c81eed5634",
"css": "globe-outline",
"code": 59412,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M916.7 500A416.7 416.7 0 0 0 500 83.3 416.7 416.7 0 0 0 500 916.7 416.7 416.7 0 0 0 916.7 500ZM830.4 458.3H708.3A537.9 537.9 0 0 0 611.3 185.8 333.3 333.3 0 0 1 830.4 458.3ZM378.3 541.7H625A476.7 476.7 0 0 1 500 817.1 458.3 458.3 0 0 1 378.3 541.7ZM378.3 458.3A475 475 0 0 1 500 183.3 466.2 466.2 0 0 1 625 458.3ZM393.3 184.6A549.2 549.2 0 0 0 294.6 458.3H169.6A333.3 333.3 0 0 1 393.3 184.6ZM169.6 541.7H294.6A535.8 535.8 0 0 0 392.5 815 333.3 333.3 0 0 1 169.6 541.7ZM609.2 814.6A547.5 547.5 0 0 0 708.3 541.7H831.2A333.3 333.3 0 0 1 609.2 814.6Z",
"width": 1000
},
"search": [
"globe-outline"
]
},
{
"uid": "d127a3831c7b7eeae853cc005a8233a8",
"css": "car-outline",
"code": 59411,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M900 467.5L708.3 313.3V208.3A79.6 79.6 0 0 0 632.9 125H157.9A79.6 79.6 0 0 0 83.3 208.3V625A83.3 83.3 0 0 0 133.3 703.3 125 125 0 1 0 366.7 708.3H631.7A125 125 0 1 0 866.7 708.3H875A41.7 41.7 0 0 0 916.7 666.7V500A41.7 41.7 0 0 0 900 467.5ZM833.3 520V625H708.3V420ZM291.7 750A41.7 41.7 0 1 1 250 708.3 41.7 41.7 0 0 1 291.7 750ZM500 625H166.7V208.3H625V625ZM791.7 750A41.7 41.7 0 1 1 750 708.3 41.7 41.7 0 0 1 791.7 750Z",
"width": 1000
},
"search": [
"car-outline"
]
},
{
"uid": "492d2ae895dab6adee9244656b22463a",
"css": "gift-outline",
"code": 59410,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M800 291.7H783.7A125 125 0 0 0 791.7 250 128.3 128.3 0 0 0 660.8 125 185.8 185.8 0 0 0 500 225 185.8 185.8 0 0 0 339.2 125 128.3 128.3 0 0 0 208.3 250 125 125 0 0 0 216.3 291.7H200A83.3 83.3 0 0 0 125 383.3V533.3A86.7 86.7 0 0 0 187.5 625V807.1A72.9 72.9 0 0 0 262.9 875H737.1A72.9 72.9 0 0 0 812.5 805.4V625A86.7 86.7 0 0 0 875 533.3V383.3A83.3 83.3 0 0 0 800 291.7ZM791.7 383.3V533.3A23.3 23.3 0 0 1 791.7 541.7H541.7V375H791.7A23.3 23.3 0 0 1 791.7 383.3ZM660.8 208.3A45 45 0 0 1 708.3 250 45 45 0 0 1 660.8 291.7H558.3A122.1 122.1 0 0 1 660.8 208.3ZM291.7 250A45 45 0 0 1 339.2 208.3 122.1 122.1 0 0 1 441.2 291.7H339.2A45 45 0 0 1 291.7 250ZM208.3 383.3A23.3 23.3 0 0 1 208.3 375H458.3V541.7H208.3A23.3 23.3 0 0 1 208.3 533.3ZM270.8 625H458.3V791.7H270.8ZM541.7 791.7V625H729.2V791.7Z",
"width": 1000
},
"search": [
"gift-outline"
]
},
{
"uid": "d0bd2fe85261823623d6da9bef73ff7b",
"css": "message-circle-outline",
"code": 59409,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M794.6 205.4A416.7 416.7 0 0 0 116.2 663.8 44.2 44.2 0 0 1 120 690.4L83.3 866.7A41.7 41.7 0 0 0 94.6 904.6 41.7 41.7 0 0 0 125 916.7H133.3L311.7 880.8A52.5 52.5 0 0 1 338.3 884.6 416.7 416.7 0 0 0 796.7 206.2ZM829.2 553.7A333.3 333.3 0 0 1 370.8 807.1 135.8 135.8 0 0 0 318.7 796.2 142.9 142.9 0 0 0 295.4 798.3L177.9 822.1 201.7 704.6A128.8 128.8 0 0 0 192.9 629.2 333.3 333.3 0 0 1 446.2 170.8 333.3 333.3 0 0 1 829.2 553.7Z",
"width": 1000
},
"search": [
"message-circle-outline"
]
},
{
"uid": "1835c1c0e42d3ea00cd4601aa06cbdc1",
"css": "bell-outline",
"code": 59408,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M855 633.8L780 558.3V372.5A285.8 285.8 0 0 0 537.5 85.8 280.8 280.8 0 0 0 220 363.8V558.3L145 633.8A68.3 68.3 0 0 0 193.3 750H333.3V764.2A160 160 0 0 0 500 916.7 160 160 0 0 0 666.7 764.2V750H806.7A68.3 68.3 0 0 0 855 633.8ZM583.3 764.2A78.3 78.3 0 0 1 500 833.3 78.3 78.3 0 0 1 416.7 764.2V750H583.3ZM229.6 666.7L278.7 617.5A83.3 83.3 0 0 0 303.3 558.3V363.8A197.1 197.1 0 0 1 370.8 215.4 194.6 194.6 0 0 1 526.7 166.7 202.5 202.5 0 0 1 696.7 370.8V558.3A83.3 83.3 0 0 0 720.8 617.5L770.4 666.7Z",
"width": 1000
},
"search": [
"bell-outline"
]
},
{
"uid": "bb78a32e7bf970fed4d6bafde5e7d80a",
"css": "arrow-back-outline",
"code": 59407,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M791.7 458.3H297.5L448.7 276.7A41.7 41.7 0 1 0 384.6 223.3L176.3 473.3A49.6 49.6 0 0 0 172.5 479.6C172.5 481.7 172.5 482.9 169.6 485A41.7 41.7 0 0 0 166.7 500 41.7 41.7 0 0 0 169.6 515C169.6 517.1 169.6 518.3 172.5 520.4A49.6 49.6 0 0 0 176.3 526.7L384.6 776.7A41.7 41.7 0 0 0 416.7 791.7 41.7 41.7 0 0 0 443.3 782.1 41.7 41.7 0 0 0 448.8 723.3L297.5 541.7H791.7A41.7 41.7 0 0 0 791.7 458.3Z",
"width": 1000
},
"search": [
"arrow-back-outline"
]
},
{
"uid": "072e146c9f4dd9464abbf40f80fdbcec",
"css": "email-outline-1",
"code": 59406,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M791.7 166.7H208.3A125 125 0 0 0 83.3 291.7V708.3A125 125 0 0 0 208.3 833.3H791.7A125 125 0 0 0 916.7 708.3V291.7A125 125 0 0 0 791.7 166.7ZM763.7 250L500 447.9 236.2 250ZM791.7 750H208.3A41.7 41.7 0 0 1 166.7 708.3V302.1L475 533.3A41.7 41.7 0 0 0 500 541.7 41.7 41.7 0 0 0 525 533.3L833.3 302.1V708.3A41.7 41.7 0 0 1 791.7 750Z",
"width": 1000
},
"search": [
"email-outline"
]
},
{
"uid": "241ce47f29cbc08a7c04f30190bdfbbc",
"css": "funnel-outline",
"code": 59405,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M579.2 916.7A41.7 41.7 0 0 1 554.2 908.3L387.5 781.3A41.7 41.7 0 0 1 371.3 747.9V611.7L171.3 227.5A41.7 41.7 0 0 1 208.3 166.7H791.7A41.7 41.7 0 0 1 827.5 187.1 41.7 41.7 0 0 1 827.5 228.8L619.2 612.5V875A41.7 41.7 0 0 1 596.2 912.5 41.7 41.7 0 0 1 579.2 916.7ZM454.2 727.5L537.5 791.3V601.7A41.7 41.7 0 0 1 541.7 583.3L720.8 250H276.7L448.7 583.3A41.7 41.7 0 0 1 453.3 602.5Z",
"width": 1000
},
"search": [
"funnel-outline"
]
},
{
"uid": "4bc549f73015749cae8557c57b6d4e04",
"css": "person-outline",
"code": 59404,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M500 458.3A166.7 166.7 0 1 0 333.3 291.7 166.7 166.7 0 0 0 500 458.3ZM500 208.3A83.3 83.3 0 1 1 416.7 291.7 83.3 83.3 0 0 1 500 208.3ZM500 541.7A291.7 291.7 0 0 0 208.3 833.3 41.7 41.7 0 0 0 291.7 833.3 208.3 208.3 0 0 1 708.3 833.3 41.7 41.7 0 0 0 791.7 833.3 291.7 291.7 0 0 0 500 541.7Z",
"width": 1000
},
"search": [
"person-outline"
]
},
{
"uid": "e2c9e40338cda97727c6cc392159a710",
"css": "search",
"code": 59394,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M862.9 803.7L721.3 662.5A330 330 0 0 0 791.7 458.3 333.3 333.3 0 1 0 458.3 791.7 330 330 0 0 0 662.5 721.2L803.7 862.9A41.7 41.7 0 0 0 862.9 862.9 41.7 41.7 0 0 0 862.9 803.7ZM208.3 458.3A250 250 0 1 1 458.3 708.3 250 250 0 0 1 208.3 458.3Z",
"width": 1000
},
"search": [
"search"
]
},
{
"uid": "832f8db91c44b49641949af77eb2fa7b",
"css": "chevron-down",
"code": 59395,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M500 645.8A41.7 41.7 0 0 1 470.4 633.8L303.7 467.1A41.7 41.7 0 1 1 362.9 407.9L500 545.8 637.5 413.3A41.7 41.7 0 1 1 695 473.3L528.3 634.2A41.7 41.7 0 0 1 500 645.8Z",
"width": 1000
},
"search": [
"chevron-down"
]
},
{
"uid": "8f315c6fff15cdcbbb4eef64124e8138",
"css": "chevron-left",
"code": 59396,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M556.7 708.3A41.7 41.7 0 0 1 526.7 695.4L365.8 528.8A41.7 41.7 0 0 1 365.8 470.4L532.5 303.8A41.7 41.7 0 1 1 591.7 362.9L454.2 500 586.7 637.5A41.7 41.7 0 0 1 586.7 696.3 41.7 41.7 0 0 1 556.7 708.3Z",
"width": 1000
},
"search": [
"chevron-left"
]
},
{
"uid": "4ebda2b68db04e6c4aca2ddc74b21929",
"css": "chevron-right",
"code": 59397,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M437.5 708.3A41.7 41.7 0 0 1 407.9 696.3 41.7 41.7 0 0 1 407.9 637.1L545.8 500 413.3 362.1A41.7 41.7 0 0 1 413.3 303.3 41.7 41.7 0 0 1 472.5 303.3L633.3 470A41.7 41.7 0 0 1 633.3 528.3L466.7 695A41.7 41.7 0 0 1 437.5 708.3Z",
"width": 1000
},
"search": [
"chevron-right"
]
},
{
"uid": "7e815eb6636c73dd9c7ca0298709b2f9",
"css": "chevron-up",
"code": 59398,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M666.7 604.2A41.7 41.7 0 0 1 637.1 592.1L500 454.2 362.5 586.7A41.7 41.7 0 0 1 303.7 586.7 41.7 41.7 0 0 1 303.7 527.5L470.4 366.7A41.7 41.7 0 0 1 528.8 366.7L695.4 533.3A41.7 41.7 0 0 1 695.4 592.5 41.7 41.7 0 0 1 666.7 604.2Z",
"width": 1000
},
"search": [
"chevron-up"
]
},
{
"uid": "38a74ac7001c4ad546a929ad9d860cf2",
"css": "plus",
"code": 59399,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M791.7 458.3H541.7V208.3A41.7 41.7 0 0 0 458.3 208.3V458.3H208.3A41.7 41.7 0 0 0 208.3 541.7H458.3V791.7A41.7 41.7 0 0 0 541.7 791.7V541.7H791.7A41.7 41.7 0 0 0 791.7 458.3Z",
"width": 1000
},
"search": [
"plus"
]
},
{
"uid": "0368de0a3778e0f6ae525794e94e3be3",
"css": "close",
"code": 59400,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M558.8 500L737.9 321.3A41.7 41.7 0 1 0 678.7 262.1L500 441.2 321.3 262.1A41.7 41.7 0 0 0 262.1 321.3L441.2 500 262.1 678.7A41.7 41.7 0 0 0 262.1 737.9 41.7 41.7 0 0 0 321.3 737.9L500 558.8 678.7 737.9A41.7 41.7 0 0 0 737.9 737.9 41.7 41.7 0 0 0 737.9 678.7Z",
"width": 1000
},
"search": [
"close"
]
},
{
"uid": "58c6e2156f964c8ff322a88e5ea774dc",
"css": "sync",
"code": 59401,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M902.5 432.1A25.8 25.8 0 0 0 905.4 424.2L936.7 257.5A41.7 41.7 0 0 0 853.3 242.5L837.9 325.8A384.2 384.2 0 0 0 147.1 360.8 41.7 41.7 0 0 0 170 415 41.7 41.7 0 0 0 224.6 392.1 295 295 0 0 1 502.9 208.3 298.8 298.8 0 0 1 762.9 357.5L694.2 346.3A41.7 41.7 0 1 0 680.8 429.6L857.9 459.2H864.6A38.8 38.8 0 0 0 878.8 456.7 13.8 13.8 0 0 0 882.9 454.2 32.5 32.5 0 0 0 891.3 449.6L894.6 445.4A44.6 44.6 0 0 0 900.4 438.7 24.2 24.2 0 0 0 902.5 432.1ZM828.3 586.3A41.7 41.7 0 0 0 773.8 609.6 295 295 0 0 1 497.1 791.7 298.8 298.8 0 0 1 237.1 642.5L305.8 653.7H312.5A41.7 41.7 0 0 0 319.2 570.4L142.1 541.7A37.9 37.9 0 0 0 128.3 541.7H125A47.9 47.9 0 0 0 111.7 547.5 41.7 41.7 0 0 0 104.2 555L100.4 559.2A35 35 0 0 0 97.5 567.1 18.3 18.3 0 0 0 94.6 574.2L63.3 740.8A41.7 41.7 0 0 0 96.7 791.7H104.2A41.7 41.7 0 0 0 145.8 757.5L161.3 674.2A384.2 384.2 0 0 0 852.1 639.6 41.7 41.7 0 0 0 828.3 586.3Z",
"width": 1000
},
"search": [
"sync"
]
},
{
"uid": "ee91404ca29189a254d0f2efd8d1111f",
"css": "facebook",
"code": 59402,
"src": "custom_icons",
"selected": true,
"svg": {
"path": "M875 500C875 292.9 707.1 125 500 125 292.9 125 125 292.9 125 500 125 687.2 262.1 842.3 441.4 870.4V608.4H346.2V500H441.4V417.4C441.4 323.4 497.4 271.5 583 271.5 624.1 271.5 667 278.8 667 278.8V371.1H619.7C573.1 371.1 558.6 400 558.6 429.7V500H662.6L646 608.4H558.6V870.4C737.9 842.3 875 687.2 875 500ZM646 608.4L662.6 500H558.6V429.7C558.6 400 573.1 371.1 619.7 371.1H667V278.8C667 278.8 624.1 271.5 583 271.5 497.4 271.5 441.4 323.4 441.4 417.4V500H346.2V608.4H441.4V870.4C480.2 876.5 519.8 876.5 558.6 870.4V608.4H646Z",
"width": 1000
},
"search": [
"facebook"
]
},
{
"uid": "02c1e2f5b1b047aa83eb3aa8194df41c",
"css": "line",
"code": 59415,
"src": "custom_icons",
"selected": true,
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"uid": "a90da023cb606196d7d2f02fd33360d5",
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"src": "custom_icons",
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{
"uid": "72db76e746089ccd7fbf6979911c619d",
"css": "ranking",
"code": 59421,
"src": "custom_icons",
"selected": true,
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"css": "sort",
"code": 59422,
"src": "custom_icons",
"selected": true,
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}

Expected Result

I wanted to see preview icon on suggestion, like standard MaterialIcon does like below.

Actual Result (Visual Proof)

Can't see any visual icon preview.

I think vscode extension shows standard Icon's visual preview based on html written just above declaration for icon class. (below link is flutter' icon implementation)
https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/material/icons.dart
I have no idea that how vscode interprets that <i>s into visual previews though.

So I can't figure it out whether it's just fluttericon.com doesn't support this feature or I did something wrong.

Thanks.

FYI, generated file (some_icon.dart) doesn't have comments of html . (Of course you already know this, I think)