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* test: regression lock for nil :foreground in --make-emoji-iconCraig Jennings2026-04-261-0/+11
| | | | | | When wttrin-mode-line-emoji-font is set and the cache is fresh, --make-emoji-icon was emitting a face plist of the form (:family ... :height 1.0 :foreground nil). Emacs validates faces on every redisplay, so a single fresh-cache state produced hundreds of "Invalid face attribute :foreground nil" warnings in *Messages*. The new boundary test asserts the face plist omits :foreground entirely when the caller passes nil. The assertion uses plist-member, not plist-get. plist-get returns nil for both a missing key and a present key bound to nil. That's the exact distinction Emacs's redisplay validator cares about.
* doc: update copyright years to 2026 and add missing author fieldCraig Jennings2026-04-041-1/+1
| | | | | Update copyright headers across all 37 .el files to include 2026. Add missing Author field to testutil-wttrin.el for consistency.
* refactor: extract mode-line icon and string helpersCraig Jennings2026-04-041-0/+128
Add wttrin--make-emoji-icon and wttrin--set-mode-line-string to eliminate three near-identical propertize blocks across update-placeholder-error, set-placeholder, and update-display. Reduces wttrin--mode-line-update-display from 40 lines to 25.