Implement horizontal mouse wheel scrolling

[BenBE]

Fixes: #2084

As noted in the original issue for this, this requires ncurses 6.6 with --enable-ext-mouse2 to be enabled at compile-time.

Patch provided by @fasterit; bugfixed on import to git.

[coderabbitai]

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Run ID: dadf8e70-f5ea-407e-8dcb-d6fa1ad36fd3

📥 Commits

Reviewing files that changed from the base of the PR and between 1a4504c and d959b3c.

📒 Files selected for processing (2)

• CRT.c
• ScreenManager.c

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📝 Walkthrough

Walkthrough

The change adds support for ncurses mouse buttons 6 and 7 when NCURSES_MOUSE_VERSION > 2. CRT_setMouse enables both press events. ScreenManager maps button 6 to KEY_LEFT and button 7 to KEY_RIGHT. Older ncurses versions keep the existing mouse mask.

Assessment against linked issues

Objective	Addressed	Explanation
Support horizontal mouse wheel scrolling through buttons 6 and 7 [#2084]	✅

Poem

Two buttons join the mouse’s flight,
Six moves left and seven right.
Ncurses wakes to catch the stream,
Wide process lines now shift and gleam,
As keys guide the scrolling light.

Merge Risk: ⚪ Minimal · up to d959b

This PR adds horizontal mouse-wheel scrolling through a localized change, and no actionable merge-blocking risk remains beyond normal checks and review.

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[fasterit]

As mentioned on the linked issue, this needs ncurses-6.6-20260829 or later. Might be worth guarding with NCURSES_VERSION_PATCH >= 20260829.