microsoft / microsoft/monaco-editor

[Bug] Enabling accessibilitySupport: 'on' on Windows causes the browser to crash

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accessibility bug confirmation-pending freeze-slow-crash-leak
Dominant language
JavaScript
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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=v0.52.0#XQAAAAJRbQAAAAAAAABBqQkHQ5NjdMjwa-jY7SIQ9S7DNlzs5W-mwj0fe1ZCDRFc9ws9XQE0SJE1jc2VKxhaLFIw9vEWSxW3ysc03PamrMPKoAvhXx6ILuyBLk06fh12TSu3fUAUW7xKzBs9R4nbtQBtdnxggF0Ctid4__CGtoqiRLO_OmLE6mo_G1O1ojZRb54_Dn-rnmR4ieFt3-BwnqTY8XKYLycXYHPS260RvgESsShHlfufNfNh4YjXRgb1Vs17MZZLEA9wKMieL5I1nbyBz9pNjuKSaUJJmMJh9j7_6XAwcwp2gDWD0GgJcwZ9IHRmyrjA8TXCnfiP1hO7PU9LTsom1ThKpNMZ4vb--l_8qY8h-keXBEqeAI6AIP7Xrkla--P8J9LIHXMtoVWUFkBNYxO1canuNOjDYUmIPhLbEZvizdxsEIB9yw0I1q--1GniP3XTc-w61tjYuNCqnS5RUG6ReEc0EnnwEpoozoaQ_3Vj-8FXZ85Ab9dtjRqHH1_cLL0RmS5qZMEPFFh7_Zg5xTnReO6IctSFNiuzOZlYTDX1WiawUQA4lkv-fbPEzJ4c87Bexy6aIs9oc7Zg1WT5D2Eon-h14hS9pc-7w1NByediLm5U_PNxQ5RaWjrKLDbHDTSwixvSlZB4zqxRsYmIIhTLxMuvyZSd0Lp7yaoWb9M0DWN8dhtlzUC-p38WuJBgA3Cd_c5zhUxHneFJYAJmGFM084rox9OXf9X83ukMAX8hyCcgCEW8d-EV7uuQMBHUy3ceCwzaXydpfVmCeHR-3MXADY2bEp8Q5G69JEb4S-bu4vpUuq2hN_pVqO8m9kDz_zg3Y1Fiz3AzvNkUV9wKif4drUxuFWNfY7Djy_p1r2JveFFsuw-wgt_O1SojUVM5YM86oJvEZChAWFvaD7jI2atTvzAqbqypNQOQRe-tJT6MNSdsIgd_KBnQ5nqw9DjtL6AjYlJPnA_RjxwLGujP21H8Z1-FoKZ1ZhedH0F18wqAHDS36n52bN-55qTPEDmR3SiFKZ3MK4OITIBxekO_bMHwKiicVZqYuEmaufGoGdTYuDCIi-HFraBh92eooafFIMTXHcoEcr0k-YSbrDo-iwUGG63Yc0K1Psl0maIuLkzsvYyRZ9kZW0jwH0Glg3gJ0QVj_kGcOzi86I-qqAC74cEm4Q1YQLE8AO_4nu0Y-mJENixpWYACBS5LErpYjhNchVgR1UGr3Lrw0dNt11Ez-FiM0dwqKFzH030FS0xiSc_qT6WNcV7y8tZC3DxcZBvNjo7ZE_hZ0k8OnHr0uDIaQ9JwkNCbG1-4BD1lSUbFoBRKzREXwIdN0tbvH-GGfZis_d2R2ngEOEgFFoe_rbFRGV2R7FwXXpbAAKw5pmf_5y8gf5x8rC4g-ZO99qNa0b-cGxhINDKnE7Ya4-sEP1VClE8y38oboAJgeTZneAWN-ELRRb5SINteaGgR5aPAAJvsLbFG7B5sdiWpmapcaQHdo4JhCrwGVERd-qXyHdY76_9UpPt3W_m9X3u3UzMxASMnOkbRGs4Kgaqq6Dd7EQS8PRF1tGaBGDUEEsIN5qDAPJqJJtPDbILQK_orKqhY3spOUIqkGmIzdjj2fpmFHND8C0lIP94ZuAhIBn_DLz4WNeOV-4FdpJlxoqTXqCjq6TgSNl5zBysLRPbM-Wd5v6D-l09VLwDO-V0hu_UC6m0f06T5laAvtaE_vEXFSnP95tibXzrn4BEDorzN9uYmzOguAwKuGs5SrZqLSYIwGNPjpfxtdYfDtOBoZZWC7fAqBe86P_Kw3eMNbVkWdsr4jFzVcv5L-CLvVtZWjWYog4FHUlJJg2qVe2tOKq_U6x7QjV5GTEwPlAl6PQOGjMRTwCsDre8wphlIMdO2nTZgHEKzANEHJG-19cWlU_Ma-pJMgtZQGqo0UPqNDpp6MyR6ZK7vNx33gZukq09CBU0qegJ6ptKkT-R2Bnq_A_TJSqffmiHWluKn_c-sPQ1fZv-zLDVtl1yRohWPHet0dk2fiKCuMEcg_0J7uJr8EccbchI9GOxeS5eXKsuk0z72K6JdsdqMHJB9mRwvb7TdHjI3wWOUfYphrSSbbzivw19Ok8o8SsOMiF9mZon5aIl64zsJcQKX2pubQdfOOS4tbOnq2KR7uaX_73SKk8S2J0IvRfc3PD1YrErlrs6HjnzZRf3FEvuDajasxMlK_DW_LRhn5fL0cPuISI1QleRXJQ29dpgifAi2ADj-K870pV9Kr_JheRf_U23NLFl2GtW8JEuulKvu6j-_FlxSM0osm9M56-6NKTjLnBmgfuoSb733yVlbmGw4m_Kyt9YwBrLATRIR20BezTUwMsYjQH2REEuS8cg8Xr6Mlq85tCITO7QJG0sUYYfWmR688OMasbwS1VF2_o7qnL6rPZ1a7FmYa1eCgJ9t_MD1t8djEK3-xqBgqNuvccvzuO8tnytI-SPEcMeyy5lQX5UlZgsUYBWPwUxlaFFWLDZ8sHruyhVy6ZDgwXf-kS08Ebd1EEP5AH1xKdFAA2HMMZloGlWMSr3q-Zp8V1fibjTFFCLg0M2hsmomgDIPK4wcP3gedMiL-0q-YHpSGFiDx7jfVv-Up8mT0zzXs9KC0tx68gYMtb-TVarSvpZDy9yS-IcnEqxQC4MeDdio2JYcZ_vOxCREwfdTcuabQLB3i-yHPqjN_wYTV2hUY4l26xtgBbhw6bhuT8vjJC7zDP7xVNkA5g7Se0K3RLbAe8yEW9uY3QC0wyHZ8Z-02CYu5iIs5cpaqWSKXZxfVDbmXYtiGDTUCQrcDZw1Mxok9AvXmRoz8TsLGVxi2opiESS05KSM2L65FxyAytC9xNLRCxwqPPqqBE3c2iKpG4CFbc4GhXhaSX-NtHxMpYFNGmTHVRQpErZ0xkyxGk8_1snMM9umMf8DmISbjp6HwO8Q7J0rHFD5Ljb5Ch7M7l7-97ZFwEg6JW1TsMlxAvpg1IpxVVaeKvqdJnjoFVus82Pg2XXmloKLYGkmQylcyEVQ0ODuk05fgafjO3SnjV-fPGXWso5Uitu1h8b5rOO8nQrgeMiUysFpLUrH-e4USMs6AVZsbHQ5oM-JSTIGjkaohxyeNrFUIA5H5AQG1U-aGgZWjlZSFjbt1rM74dz7cs1etTAzhsJg2M1bgWW4JqmYVMWwLfVT62aZZ1RQ4VUuSkocqkys0dV6xqtS0zM95-FD5oaiYaddJYa7ahaEHGxu_-I2KmnoAsm7Ms1tQnHYUH8rErVniOdUvTZaVjjy0yAqQgTnar155C9k-qDT1RsLz6RSEVcNvoBcdrC7QpJUtl94BjJfTGavTwap2cQ0_-uzCnSwsI5xBefBYXlF-f0MS6AA9Ls5O7GdO_EzhxgCebGjBYQnLX-LNW9n0QWIKhhhI5iwIxXUhRhm2b5YWUsGPVV2P10T5lEzYjlhS4Sj_Ud5hoCIaw_vL9a14OqLey7Sq_3qiWRS6q3FIU_yf36BIMfjrY232Los2HKCimHtXrT65NaSRnOosqI2z56fXlcVigK4ZK3iCPWMyVVbOFccdflMKsEW4XtNqPmDDN4MCeIZ8qHYrFPvUnbmhMDsD0dg7ywIawK-q9Rww2reKkFWP1zeZwSfdjDqE3Ni7Oys5OgrR65dpvzzcyvCC-ZK6q1Uw2WumKEHlGfzv53vvHOi_hA4BYkytLdhmrBugsSPFnvwrtbXPtv-0H1f0YhnkNmorJVj5A6hIEDQwZWh15dKylYJAkyxvdCDe0C_OHiaQXtIEuwQyDP3Fiwwf7eWOYzjrQ_QcWatp_AXfS-RML2QuY2Ty9t2lVfx2zj9nKNHCbGqa7rzJRjWorm0MXq5XfI2CLXDyQFb9OYF87rZqP6awy7iH-SDY0-OupxB6VAPzLyDx0RxStWmGz-aUy0FdUb7iMJjqNfdRp3nAm8EkhlVcvb5jPYuRBJupqzHas97JzwtiSL7PtL5x83ZsvARc6V4vOnrbgdkDifCOhJ_Et53p3Zwa5HPwZVxxyvy0k-WAYcjKR0Neci0zJulPV1ZA_kpGN1fQyG3M1ElCgq7WHa0jaFbuL45StaicRF-cURzJq3t5XbjG0gtl1w2rN875EDIk7o6VAa2KjO_sYwUY0bea_ksH0gR6iuCHyfrXp710qkNpaANIN3JLg9MyKI_7-SeMyPyS4nJs3ynihv4WqhH0BEM0Lwr6_wVm_sp4S50EPoe_omVswUZU2dIa546S5c9caeHF6EHhCs6ShtUyPLzsB_krvCwvqgCTEKWbhmYC_E2TKy-2Zo-LK9mUveLBhQy5zFiHImOSrOlINsomvxUZhGhMX6Mg2VC4LPHRvyvy4j9PHMN2JU5m3NwhYmLsW_8R-Uj6_hBBgmNb72Flk0ButmRhjY_5Qrm3p2zSoJ3UMo-3tXR-EeRqz7hkNXbK3lrbKuhsJN4kt9xie2ge0CUfDxYb-jc0UedIXAWCZQ2vs2fX2HQljSCJ6AMjxgavdM0jXTvtriP0-5TOJaiUUE8LDbCc-gQVjFpKv6I5c9PIXEQOGVMPHiLvETaHItCjKohHA5axEkD3NALPIGiTVhnghRt9m5kSVZzR9Bvq1DBc0WiDoAIbuMSRu2321clmRKQqWui_VfKVzuGGiy73MveraX2uOBj50zbYoELz_6ZPdxvKB8YdH9-T3xI0_ntWD-ax66o0cbllT1pt3k6kfexE493jTU1OVEOJRjBHYtyvp1FvkViMgfBM8KoDHL67TSDXb2HMk_RNpLcE_Xz1BXZeCq7Olwbt3R1vJQ-ed4Mriud1rcqoKM0rMMRDRaIfk76Q4Omr-7Bc8kub0FRd7jxCLgKju-bpr5hXqjEv4grzztyhC99K9cIapS3HEeEVM201ZeGnEXZCCZtlwUjrKsXaho_G6wF9_iYPVHVtmLxeIgN3ZXsPtXzXkznKm1sgdn04P0VmIQ4naMZWB9DGv7EGx62I98a4h9s6b4Z2VxHl_9ZLU4YzGR_Z2qE-dUMOc-BLNkMKwMsrYwU3eJ0JgDOgwJSxjgQXAGI5gzFK2Tb1sjP8AqpkICQconPtIGVprKZLStzy0dysTAfPNMn0Rp_swvv6X0-3-1uTN-_FGTbVaiwzgYjqgSj_DIIYg_Z3Z6pljU9uAQTt6jLe3Dw1K4SqIK9YMkx2wjsUB3D-J5vM9YpkXL7R1h5dATkpXtikNuu1IlBEBbCj7ZdLM-sGwGjHqJ19sxfUEq5EX5Sv8kKDth4HQQbHp6pBKJI3LG6oix5QXZhSkGxipMypFvdX73DHeCMgeUzyLxR6XjfqAEhjVPwm6DCGYNj2UTSy6aLFlwGTuUq-Qt7rQZwNofElWzM_hHBQgZ_kSbtBtlsIpqZc3s0clVHNeHn22vw7BRWYXtl-1cBnE-Wzn4v5LSoTxu62cJFUClPXaDmAKLyNI_nyWO2ri6uO90n0bWWVc1oO4cZDVgmt5CnK0t8tTN39NIxSmNwkPh8wECf2YW5WB9t6gseR7LFtP2q1MgX3RXvtBezZLOQS_N-Ewk4CG34QLsUgMOrZcJQmWXheCLq-llQXNxOdUjIDqUpvtTmHhjK4MWx6YFiBY5QwnUoSpH4gG8vLKj5K4Lxv7U_p9QHoF885Nn3d6drDMynKFrI8BmgTFj-b_oBvTY0cXufulSI5ug9K9w8oW-1DhnP41yqPAit3DaUdZS56zoEpJRtFKOBIz7iVFouPmwDwpZQCv18r6NSG8boZCqsqkHBPWWg71rzedLE0TckJeEMBLh-LxApTWMV7feYtsNRGHtVr3ia76tBbiviBIkIdtEZ8s7xSZowg8pfetKRzsIBhWa3qfsz1L_066o2cL24V94-y17fPLXJX5vaS_shPw__a99L7CR96aKf1WLA3B46I2Tag_VaQzS-i80GoB-NTOdywUZhquRiFv1O7Zy3nESDvMeleuoGEhr91XmdqKTtCNwIec7mQdawqxXl-elu5Ks_-l3g-jt8McLn8kw2GKduHFGIFPQKI7AcS8tkho5yO_Q21zm1XHHUKGYtoTWRf-08yML0YSiOxKPr4bAy6xU7320XcihCZIDEWSF_WPNYjsvdst9Jlq777H1XS_9KoSX-3TYWjxzMOaoWCetVtYBpj0boYu78bkCb0i7P-vqdiTv5D1ootJlG4i3hTVbhnUBQNG6en_jc4k0iwcTOUMuq45Z19QB0jGlVHpXDFDSCvuj8ubgskTzHoXGHMb0u_p-jJpgn5aRRk6qlF25AnaAlg2qI68ZTt00nOZmlMO67ttQt8bGSCZgahfIuNnokMzMDMtYpmIPw4cNGfU15z9D_9qVB0Q

Monaco Editor Playground Code

Reproduction Steps

After selecting lines 322 to 336, pressing shift + tab multiple times will cause the browser to crash.

Actual (Problematic) Behavior

cause the browser to crash.

Expected Behavior

it is normal

Additional Context

No response

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

Start with the Monaco Editor playground link and reproduce the crash on Windows by enabling accessibilitySupport: 'on', selecting lines 322 to 336, and pressing Shift+Tab repeatedly. Trace the browser crash from this reproduction; done means the same sequence no longer crashes and normal behavior is preserved.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript
Domain
accessibility, frontend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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