JetBrains Session UI Icons And Header Layout Plan

Goal

Improve JetBrains session UI icon consistency and reduce accidental header interactions:

• Use Kilo/VS Code-aligned session icons in session views.
• Fix the reasoning header icon.
• Normalize session part collapse/expand chevrons so collapsed/expanded states do not jump between differently sized glyphs.
• Move the session-details toggle away from compaction and place it before the session title.

Findings

• Session view icons are centralized in packages/kilo-jetbrains/frontend/src/main/kotlin/ai/kilocode/client/session/views/SessionViewIcons.kt and loaded from frontend/src/main/resources/icons/views/*.svg.
• The JetBrains views SVGs already mirror the shared VS Code/UI icon paths from packages/ui/src/components/icon.tsx for the audited names, including brain, chevron-down, chevron-right, checklist, console, warning, etc.
• The reasoning view currently renders SessionViewIcons.eye in ReasoningView.kt; VS Code/shared UI uses the brain icon for reasoning/thinking surfaces, and SessionViewIcons.brain already exists.
• Standard collapsible session parts use SessionViewIcons.chevronDown when expanded and SessionViewIcons.chevronRight when collapsed in AbstractSessionPartView.kt; QuestionResultView.kt repeats this pattern manually. The down/right SVG paths have different visual extents.
• The session header currently places the details toggle next to the compact button in the right-side controls in SessionHeaderPanel.kt, making the two actions easy to confuse.

Implementation Steps

1. Keep icon sources aligned with VS Code/shared UI

   • Treat packages/ui/src/components/icon.tsx as the source for Kilo web/session glyph shapes.
   • Re-check SessionViewIcons.kt entries against available JetBrains assets; only update or add SVGs if a session view uses a Kilo icon missing from frontend/src/main/resources/icons/views/.
   • Preserve JetBrains SVG theming rules: no currentColor; use literal palette colors and dark variants where assets are added or changed.

2. Fix reasoning icon

   • In ReasoningView.kt, change the reasoning header glyph from SessionViewIcons.eye to SessionViewIcons.brain.
   • Add or update test coverage in ReasoningViewTest.kt by inspecting the rendered Swing label tree and asserting the reasoning icon is SessionViewIcons.brain.

3. Normalize collapse/expand chevrons for session parts

   • Stop using the mixed chevronRight/chevronDown pair for collapsible session content.
   • Use a single base Kilo chevron glyph for both states, matching the current custom chevron used by the session header (/icons/chevron-down.svg / equivalent SessionViewIcons.chevronDown).
   • Add a shared rotated icon for the opposite state instead of switching to a differently sized right-facing asset. Prefer a small reusable helper or centralized icon field rather than importing header-specific UI into session views.
   • Update AbstractSessionPartView.kt and QuestionResultView.kt to use the normalized chevron pair.
   • Leave QuestionView.kt navigation chevrons alone unless auditing shows they are being used for collapse/expand; those are previous/next controls, not expand/collapse controls.

4. Relocate and change header show/hide details toggle

   • In SessionHeaderPanel.kt, replace the custom header details chevron with platform AllIcons arrows/chevrons, e.g. collapsed = AllIcons.General.ArrowRight, expanded = AllIcons.General.ArrowDown.
   • Move the details toggle out of the right-side controls and into BorderLayout.WEST of the header row.
   • Rebuild the top header as:
     • outer border layout
     • west: details toggle button
     • center: inner border layout
     • inner center: session title
     • inner east: horizontal stack/row with price/context and compact button
   • Remove the details toggle from the right-side row so compaction remains visually separate from show/hide details.
   • Keep existing tooltip/accessibility strings and expansion persistence behavior unchanged.

5. Tests

   • Update SessionHeaderPanelTest.kt to assert:
     • collapsed/expanded header details icons use the selected AllIcons constants;
     • the details toggle persists expansion state as before;
     • the details toggle is parented/laid out separately from the compact button.
   • Update AbstractSessionPartViewTest.kt to assert collapsible parts keep the same icon dimensions across collapsed/expanded states and no longer use the mismatched right/down pair.
   • Update QuestionResultViewTest.kt similarly because it has its own chevron implementation.
   • Update ReasoningViewTest.kt for the brain icon.

6. Verification

   • Run the smallest relevant JetBrains checks from packages/kilo-jetbrains/:
     • ./gradlew test --tests "ai.kilocode.client.session.views.ReasoningViewTest" --tests "ai.kilocode.client.session.views.base.AbstractSessionPartViewTest" --tests "ai.kilocode.client.session.views.QuestionResultViewTest" --tests "ai.kilocode.client.session.ui.header.SessionHeaderPanelTest"
     • ./gradlew typecheck
   • If the filtered Gradle test syntax is not accepted by the project, run ./gradlew test from packages/kilo-jetbrains/ instead.

Notes

• No shared upstream opencode files are involved; changes stay under packages/kilo-jetbrains/.
• A changeset may be needed because this is user-facing JetBrains UI polish; confirm existing changeset policy for the private JetBrains package during implementation.