microsoft / microsoft/monaco-editor

[Bug] Option `editor.selectionForeground` does not work

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Description

Reproducible in vscode.dev or in VS Code Desktop?
  • Not reproducible in vscode.dev or VS Code Desktop
Reproducible in the monaco editor playground?
Monaco Editor Playground Link

https://microsoft.github.io/monaco-editor/playground.html?source=v0.55.1#XQAAAAKqLAAAAAAAAABBqQkHQ5NjdMjwa-jY7SIQ9S7DNlzs5W-mwj0fe1ZCDRFc9ws9XQE0SJE1jc2VKxhaLFIw9vEWSxW3yscyb4bmOOQ5IgqMrQKs8_2EC2C-USLEKSl0VeXkg-7XgP_KUgzQmYsB89qXlvLk2yg6Epin4SaSIZDkDFJM5gDJljl9rbJZ-jOocuQQ9oTSffy4X2qOhkdS2WmivPfDYex5GjwgWnAO3LYsSfxUvy6H2gInwkWXQolYMZieakD0V8z4128JiuZNt6B3Roj_grCY1k1iBycsVtlDEm-sRt1FODPVeU2YSyAtjHogAmn8nhw_0PJQ8Bone8DGLutha2LNbPWyXZClJAD5ymqEj5A5xebBoJo6cvN6n8ku-sJhtRLtBMo30KIVD8aUSHeTBYJ6FDZQjUaKsOo7g4aDpiKhP-ciTbJHZDAHCut-aTVBm_x83hF7rLN8tsNN7Gr-y8le28OZalDDtq0dic14stpfmCNqwwG0TUOIvdwygky5z8crzDbqUc1XcQcLKUKMUDJW5_2FLXa5fguocTfCw37nYr0EYbdmRyyvBfZdPfuC2GlhSK2Zsh6G9uRl6wny7bKNeYxUwIkNzxvcKGS4QvjsbeNnrqHWFenH22ipcWQPO2rT2RWCIAo_gJoJw0BOj1mrGF0_NXMkDwMivGlClDODkTE6TmP6AiNmGF5b_pRckyfGLcbu0GXmXdgY3wlMh6u6Afv_esiM0j6sH43Ggfpwl_K-oJFQgVy1JBs3bVxH1HL9_T4mKsk2qyQv4iv7j7hmPvvMesvvkxqASpxkBOav1sOrt5NRF1ZZy6U_WMiscl6xh0QSrga2bR5_yXcvw9wetPyvq6C4IXaFym-u01sslSMOE7jAoZYVm80RT0vqQEL9ZJLOfg1RvvuVJfU6QNOkCXCRzMjNZoTN5Q2QCjkvvLsMKlEY9Egy-jdD0p2r3Sb3ser5r-rB3WJPWMeHyCLLnJqGyblUP7wpZmsRWesyQXvcU2Ugy9VMcs2pozh2VuAh1ZvjtNeRhuXq11u2F4YgeXP-HQbBMUTEtsIqIT_GLhfMN0KKS-DXeBetp6AeeK9oxtl107hUxMr7rLBER-orYaXzYk4iWfjFJewzkwFjd2KLz-Jg7q945LpMTdm1K20rQeRbJbdQ-PlbDdirtQp5KLsVkVgtpZqeYl1Z6l5fLVsod49IQyaXrNRIydluZPw_4bnS9hkb_rxKq91OAaRifHSEpvPgzZ1nD4eW0Eidin9AMw0oULttXJUWOe337Hd3dQyKPfLjCb63IJ73fCtECXcpbeiWGD2toJ_TbMIC9FE1U1rfBs5YLByIdLJujkCiFreElIvopTOlkIxMM9DqfdxGRxlz1_qU4PeVKWdGWsHzPxU0kRswG5NYpMSsIPYsj6o3EzEeE0DxkRlzr-qi8xjzC51lbT8cs9n4EUHQc_KrgzW_xdi9tj7wOLZbjjLZpS37MTuflW_m3KxgTQVM6D_4TZHaKIyEejURpUqtcHuHIqQ0uAmua8BgsuEfYxdpr7TiC1Ca4errHrKxqUi-ZyHI60kIB0B8411H7GvKslO1r9FH6IJYpzGFoYOa4jhpRSL5e9VzDoi_ZuQjBZRWX0RwGH7nrvNNgWxxoENcnSBZCvWSmCiBLU9yl-laO4tZpBXtKkIaghbQgLzMu5pC_YYJtCBPV8EAOUvF1fx48Ih1awICb9UdHEVnNbDIkKjLRoXt2cdW2FeHqldP4fw23wtuVXP1dXnel-OZM-KEIAbvv0rpRx_06X3KlASM72a73eaJIdPGr6aavnz-2aHIjjA9X_zUYm59Wjp33XNmxor9ibaaqrE-s79VEeEPI_DZ0NZcUCCFgDO9rHTplHRrUqIjeDdqlxqY3gXJnhLeNAtYGOGq3OXRIoeigvxi92n1GypLRCY3nZFRTwNBW_pgFPnUqBb5XyIMwpM2nt4rhsNJ8iiKUpEHFHM8msHADl76nRezrgWA5wvktLcmSaTnAG4LHkQk8Wkuzn9o5JRTyfO-bURRqD6PDEbOfT-LO4W1KnEifgt2WXO3R4IEjHBQNpc0kU9lKfXO0DyiZ4FTLu_QR-zEE3uOOZ0uATcsw59yi6bkQKrY13zvw24pDnkDGCIYZknguVasEgqNmIKt-8AJOTQ8BLwhmgT0wh-6KhiYyHjeKieit2L9lElGKZZnguPsKDEnS5MkNUtLwXjRkue8ZIIBnyZNSkUXSaefp0dfh84M-lp6vOPVbRIp8ZW4T2Ndfx7CAFFMwYeazs434g18xeKczjM9RsG9YbroXFhj7z4iV5Z91SCDBovITzQ76kBDdUsLSrm0fp4qCHvTGlCxZFe2dhIznDkS3v_x-A05b0WflrNjuE3WYF-JLrz7zHkAlCLUl4ZSJRjzJ_hZaGlEsWC05-nbS-1SfKubDGZXlDYOcPTjzmP9q_rSNOr3iPhkJmD5wey-IdaA_aFiG8uWf-qaAgvvXewF9uMgKHOyInV3FbtCsX2UA81ZopX47VDtNB5Qc44lVt5WxvgGVnQT6c6phbcak0J-yMVGZdE95orlHiS5J_y5_f7Pdv3xUt5KHzIs2Yet3m5rx7aCICuYbcGp_QnpVxOtjQhaBILy5bSBYubm_nmWEMOtPXvSwuoNfmxjSAED6b00Jx4naBtOkd4pfbG7fIX8lyDmjRsk6v82NihPN-x60etykF5eini0z9_BCyM9FdDIZNQP412Uw-SWbo6LdpkxtEZsoPjI9qIZ6lk-4XqiYcD0vUtQu0ojgIJsswSEVlSBLEt6MlEYDFFRdH3s69UhYN-rxMPOxkqdkmA_Bh4RNGv1Z6zZuiOdxyStqjCstDHi7dBQoSid3id2IWkGYkKHIITRQeDXJ63tcwFRgtm3ara-jYHS95EbVVK2JEkpzBnOuqAahIG-2yj-rcqZ4ylI_6ukngo6JFebvysu-7nG74tTF-h2MP7na_gQzVr37gBCodFmGPuQB0fZeQsOjyvYIWBzrN0wz9huLT3eLQ_oCGV3rC5f6f-6i1dUf6HGk-w3gvRo-kjbc9b0HwQGUYgl57nZD-FmeFwW0vsP5lnD2o-A7XFsIynE1fR_UMQf76nNtVEhLCwA66FdXAxZejwalAcy_9xlTl2ODjhNlGZSQpGNqUlfBi3K1l_5H51enV6Z3mB0Of6Kw6qyzuBWFUHrqIIZog64ndY_HxhXdXCu1fHNU5Dzmwj64InDn_QEuv_cRiP2u69Y9xMHqRxZ1tvmeAGrLL6SHQZSjR_0TK2pA8VZVJWAzNpARIZrAzX1O_LOtr0W8oU_6YbU89tq6vcpd-h0bwXRF8S1tccLvrfMyX8z-lUQL5XoesQdPI40lpt9CCZMlgReA44bjH9NVMRyXF3vWdRTcdpmBkz3y-yBzGs-RBog8VspJtzf_9p3AaM

Monaco Editor Playground Code
monaco.editor.defineTheme("myTheme", {
	base: "vs",
	inherit: true,
	rules: [],
	colors: {
		"editor.foreground": "#8B0000",
		"editor.selectionForeground": "#008800",
	},
});
monaco.editor.setTheme("myTheme");

monaco.editor.create(document.getElementById("container"), {
	value: "My to-do list:\n* buy milk\n* buy coffee\n* write awesome code",
	language: "text/plain",
	fontFamily: "Arial",
	fontSize: 20,
});
Reproduction Steps

Try to set a style for a selected text.

Actual (Problematic) Behavior

Option editor.selectionForeground are completely ignored by Monaco editor

Expected Behavior

Option editor.selectionForeground must change color of selected text as described in example

Color of the selected text for high contrast.

Additional Context

This behaviour breaks our dark theme:

Image

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Run the linked Monaco Editor Playground reproduction using the provided TypeScript theme and editor configuration. Start by tracing how the editor.selectionForeground theme color is applied to selected text; the work is done when the selected text uses #008800 as expected without breaking the demonstrated theme behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
frontend
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
45/100

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