Harden horizontal scroll offsets

[fasterit]

Spliced out from #2099

This makes htop only scroll right if there is something to scroll right to.

[coderabbitai]

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Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 892d8589-9adb-4a67-8760-a76f8679006a

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Reviewing files that changed from the base of the PR and between b9a2a63 and e385e20.

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• Panel.c

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📝 Walkthrough

Walkthrough

Panel_onKey now clamps horizontal scrolling after left and right movement. Left movement cannot set scrollH below zero. Right movement cannot set scrollH above the selected text width minus the panel width.

Suggested reviewers: germanaizek

Severity of issue fixed: Low

Merge Risk: 🟡 Moderate · up to e385e

Right-arrow navigation can overflow or calculate an incorrect horizontal bound for exceptionally large rendered values because the offset is incremented before clamping. The arithmetic should be made overflow-safe before merge.

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_{Left scroll stops at zero
Right scroll meets the text
The panel holds its bounds
No blank space lies ahead
Keys move with measured steps}

_{Comment @coderabbitai help to get the list of available commands.}