Mail: Columns reader pane is ~80 px wide at 820 px #1454

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opened 2026-10-08 08:48:07 +00:00 by kayg · 1 comment
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Problem

Mail Columns layout at 820 px wide (sidebar open) leaves the reader pane about 80–150 px wide: the sender truncates to "M.", the subject to "Latest r…", and the body wraps one or two words per line. Evidence: worktree readerx-1427, artifacts/reader-header-1427/columns-820-tokyo-night-dark-after-click.png.

Expected

Columns never produces an unreadable reader. Follow the Mail list/reader responsive rules (#1390): when the reader pane would be narrower than a readable minimum (about 22–24rem), the layout adapts — e.g. the list pane shrinks to its minimum first, then the reader opens as Split (below) or Morph for that width, or the sidebar collapses — whichever DESIGN already specifies; if DESIGN is silent, use the Apple Mail behavior (narrow window: list + reader stacked/pushed) and record the decision. The user's chosen layout is remembered and returns when the window is wide again. No layout jump while dragging the pane edge.

Screenshots at 820, 1024, 1280, 1440, light and dark, Columns selected, with a message open.

## Problem Mail Columns layout at 820 px wide (sidebar open) leaves the reader pane about 80–150 px wide: the sender truncates to "M.", the subject to "Latest r…", and the body wraps one or two words per line. Evidence: worktree readerx-1427, `artifacts/reader-header-1427/columns-820-tokyo-night-dark-after-click.png`. ## Expected Columns never produces an unreadable reader. Follow the Mail list/reader responsive rules (#1390): when the reader pane would be narrower than a readable minimum (about 22–24rem), the layout adapts — e.g. the list pane shrinks to its minimum first, then the reader opens as Split (below) or Morph for that width, or the sidebar collapses — whichever DESIGN already specifies; if DESIGN is silent, use the Apple Mail behavior (narrow window: list + reader stacked/pushed) and record the decision. The user's chosen layout is remembered and returns when the window is wide again. No layout jump while dragging the pane edge. Screenshots at 820, 1024, 1280, 1440, light and dark, Columns selected, with a message open.
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Deployed to production in merge round 37 (ac7fda1a8, 2026-10-10 21:37 IST).

Deployed to production in merge round 37 (ac7fda1a8, 2026-10-10 21:37 IST).
kayg closed this issue 2026-10-10 16:07:36 +00:00
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Reference
kayg/calternal-v0#1454
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