dsh-edit-diff

The built-in edit and write cards in the DSH web interface have an annoying flaw: change a single line and the diff drags in three lines of context on each side, rendering every unchanged line once in the red deletion zone and again in the green addition zone. Fourteen lines of red and green mush up the view, and you cannot tell what actually changed without expanding a second-level fold.

dsh-edit-diff takes over those two tool slots and strips every identical line out of the picture, leaving only the true deletions and additions. For equal-length replacement pairs it runs a second, character-level diff and underlines exactly the characters that moved, instead of painting the whole line. Under the hood the algorithm first trims the common prefix and suffix, then applies Myers only to the small intermediate band, so complexity scales with the size of the change rather than the file, and even multi-megabyte edits stay smooth. Cards collapse to a one-line summary by default; if the diff exceeds fourteen lines it folds into head, ellipsis, and tail. Font size, border radius, and color all reuse the same CSS variables as the native DiffBlock, so it looks like it always shipped with DSH. Edit, write, multi-file, and PTC sub-call scenarios are all covered, with zero npm dependencies and a pure browser-side footprint.

If you lean on edit or write heavily inside the DSH web interface and are tired of spending ten seconds guessing what really changed every time, this plugin is built for that moment. It does not touch DSH source code, pulls in no external libraries, and is gone just as cleanly as it arrived.