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Explorer panel: add vertical scroll support (mouse wheel / touchpad) #311753

@khusantoy

Description

@khusantoy

Problem

The Explorer panel does not support vertical scrolling via mouse wheel or touchpad. When there are many files/folders in the tree, there is no way to scroll down using vertical gestures — the panel is not scrollable at all (or scrolling is blocked/broken).

Expected behavior

  • Mouse wheel up/down should scroll the Explorer file tree vertically
  • Touchpad vertical swipe should also scroll the tree
  • This is the standard expected behavior for any scrollable list/panel in a desktop app

Steps to reproduce

  1. Open VS Code with a project that has many files/folders in the Explorer
  2. Hover over the Explorer panel
  3. Try to scroll down using mouse wheel or touchpad vertical gesture
  4. Nothing happens — the list does not scroll

Environment

  • OS: Tahoe 26.4.1
  • VS Code version: 1.116
  • Display: [single/multi monitor, HiDPI if relevant]

Workaround

Currently the only way to navigate is by clicking and using keyboard arrows, which is slow and not ergonomic.

Additional context

Vertical scrolling works fine in other VS Code panels (editor, terminal, etc.), so this seems specific to the Explorer tree component.

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