fix(panel): restrict auto-sizing to file tree content only

[dlyongemallo]

No description provided.

[Copilot]

Pull request overview

Adjusts Diffview panel auto-sizing so the computed width is driven by file-tree/log content rather than long header lines, and ensures headers are re-truncated after resizing.

Changes:

• Re-render after applying auto-width so header lines truncate to the final window width.
• Add Panel:get_autosize_components() and update compute_content_width() to optionally measure only specified component line ranges.
• Update Diff/FileHistory panels to restrict autosize measurement to their main content components, and add functional tests for the new behavior.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
lua/diffview/ui/panel.lua	Adds autosize component hook, restricts width measurement, and re-renders after auto-resize.
lua/diffview/tests/functional/panel_spec.lua	Adds tests for infer_width open/closed behavior and autosize-component measurement.
lua/diffview/scene/views/file_history/render.lua	Computes root path per-render so truncation reflects current panel width.
lua/diffview/scene/views/file_history/file_history_panel.lua	Restricts autosize measurement to log component.
lua/diffview/scene/views/diff/render.lua	Truncates revision pretty name while keeping hash prefix visible.
lua/diffview/scene/views/diff/file_panel.lua	Restricts autosize measurement to file list section components.

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