Agents Window: Editor action buttons overlap when tab wrapping is enabled

Type: Bug

Description

When workbench.editor.wrapTabs is enabled in the Agents Window, the editor action buttons overlap each other and can also overlap with the Add Tab button.

VS Code version: Code - Insiders 1.139.0-insider (289549a85cd652ce3513ac63044495a2ac620752, 2026-09-18T09:52:25-07:00)
OS version: Windows_NT x64 10.0.26200
Modes:

vsliv368cf:30146710
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4je02754:31455664
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ge8j1254_inline_auto_hint_haiku:31490507
cp_cls_c_1081:31454833
conptydll_true:31485575
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c9b86496:31447327
ei9d7968:31462942
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ddid_c:31478205
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cp_intellij_t_nes:31548657
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treatment-23-1:31555779
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mangle-name-treatment:31568054
allow-signed-out:31574470
codex-agent-enabled:31566739
intellij_nes_preview_t:31580086
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issue8950-e3349a92:31574958
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1cff76af:31580265
96d59efc:31580278
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links-treatment:31581067
7g328426_fixed:31583679
54hd3363:31585488
skill-budget-15000:31586215
permission_prompt_treatment:1332566
ccr_pr_nudge_auto_review:1319472
vsc_wsm_t:1324223
ce50c479:1394169
3aced641:1389836
sem_714gi995:1394171

Cause

When tab wrapping is enabled, both the .editor-actions element, which contains actions such as Add File as Context and More Actions, and the .editor-layout-actions element, which contains actions such as Maximize Editor Area and Toggle Details, are absolutely positioned at the bottom-right of the title area.

Because both elements are positioned at the same location, the action buttons contained in .editor-actions and .editor-layout-actions overlap each other.

src/vs/workbench/browser/parts/editor/media/multieditortabscontrol.css

.monaco-workbench .part.editor > .content .editor-group-container > .title > .tabs-and-actions-container.wrapping .editor-actions {

	/* When tabs are wrapped, position the editor actions at the end of the very last row */
	position: absolute;
	bottom: 0;
	right: 0;
}

src/vs/sessions/browser/parts/media/editorPart.css

.agent-sessions-workbench .part.editor > .content .editor-group-container > .title > .tabs-and-actions-container.wrapping .editor-layout-actions {
	/* When tabs are wrapped, position the trailing editor actions at the end of the very last row */
	position: absolute;
	bottom: 0;
	right: 0;
}

The existing rule reserves space by applying a margin to the last tab. However, when the Add Tab button is the last child, it is not matched by the .tab:last-child selector, so the margin is not applied to the Add Tab button.

As a result, the Add Tab button can also overlap the editor action buttons.

src/vs/workbench/contrib/modernUI/browser/media/tabs.css

.modern-ui-tabs .part.editor .tabs-and-actions-container.wrapping .tabs-container > .tab:last-child {
	margin-right: calc(var(--last-tab-margin-right) + var(--vscode-spacing-size40)) !important;
}