Webview content and Loader stuck until scrolling on theme change (IntelliJ 2025.1 & 2025.2)

IntelliJ Platform
1

Description:
Our plugin displays a webview (JBCefBrowser) inside the editor tab.
In IntelliJ 2025.1 and 2025.2 we’ve observed repaint issues:

  1. Theme Change Issue

    • When switching themes (Light ↔ Dark), the webview does not fully update.

    • Some portions remain in the previous theme until the user scrolls inside the webview.

  2. Loader Issue

    • Our plugin also shows a loader (React-based) inside the webview while performing background actions.

    • Sometimes the loader remains stuck (even though the action is complete) until the user scrolls or interacts with the UI.

Both issues disappear after scrolling, which indicates a repaint invalidation problem.
Neither issue is reproducible in IntelliJ 2024.x.

Steps to Reproduce:

  1. Install the plugin that displays a webview in the editor.

  2. Open the webview tab.

  3. Perform one of the following:

    • Change the IDE theme (Light ↔ Dark).

    • Trigger an action that shows the loader, then wait until it should disappear.

  4. Observe:

    • Theme or loader does not update correctly until scrolling inside the webview.

Expected Behavior:

  • Webview content should update immediately when the IDE theme changes.

  • Loader should hide automatically once the action is complete.

Actual Behavior:

  • Theme update and loader hiding both only occur after user interaction (e.g., scrolling).

Environment:

  • IntelliJ IDEA 2025.1, 2025.2 → Reproducible

  • IntelliJ IDEA 2024.x → Not reproducible

  • JDK: [21]

  • OS: [Windows/macOS]

Notes :

  • Appears to be a repaint invalidation issue with JCEF integration in IntelliJ 2025.x.