News in 5.21.0, 2026-07-11
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This is an unstable release for GNOME 51.alpha

 * GtkSourceFileLoader now rejects non-regular files before opening
 * GtkSourceFileLoader now bounds expanded input size, including
   decompressed input, and reports oversized loads cleanly
 * GtkSourceFileLoader now unwinds buffer output streams on load failure
 * Fix gutter and gutter lines leaks
 * Break a circular reference when line numbers are enabled
 * Improve Vim emulation for repeated commands, r, cw/cW, +, X, gu, gU,
   g~, Ctrl-A, Ctrl-X, and :set aliases
 * Fix vertical alignment when jumping to iters
 * Improve context engine and search context performance
 * Use canonical property names and static strings for properties
 * Translation updates, including new Lao translation

News in 5.20.0, 2026-03-16
News in 5.19.0, 2026-02-23