mirror of https://github.com/deepseek-ai/deepseek-harness synced 2026-08-15 21:04:50 +00:00

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creatixchu e465806120 fix(web): scroll to the caret after an edit the composer performs itself

Pasting a long block left the view where it was while the caret sat at the
end of what was pasted. Paste, ctrl/meta-Enter newline and cut all suppress
the native edit — the machine owns the draft and the undo log — and restore
the caret with `setSelectionRange`, which reveals nothing: measured in
chromium and WebKit, before this branch as well as on it. Firefox happened to
reveal it, in the old geometry only.

The three restores now share one helper that measures the caret against the
hidden mirror — same draft, same metrics, same wrap width, so a Range
collapsed at the caret's index reports where the caret is without a caret API
— and scrolls the scrollport the minimum that brings the line inside, which
is what the browser does for typing. One scrollport is what makes this
possible at all: the reveal is finally a single offset to move.

Also from review: the composer's own focus() on unlock and session switch
passes preventScroll, so a session switch cannot move the transcript through
the taller textarea's reveal chain.

2026-07-31 16:07:55 +08:00

1006 B

Raw Blame History

Composer draft scrolling (14-line cap, two text layers, one scrollport)

At the start of the draft

draft overflows the capped box: true
visible lines: 14
the textarea holds no scroll offset of its own: true
all three layers wrap at one width: true
scroll offset: 0px
caret and glyphs stay level when the offset changes: true
first draft line is on screen: true
last draft line is on screen: false

Scrolled to the end of the draft

offset moved: true
caret sits on its own glyphs: true
caret and glyphs stay level when the offset changes: true
first draft line has scrolled out above: true
last draft line is on screen: true

Draft ending in a newline, scrolled to the end

caret sits on its own glyphs: true
the draft's own last line is on screen: true

Right after pasting a long block at the end

the composer scrolled to the caret it left: true
caret and glyphs stay level when the offset changes: true
the pasted block's last line is on screen: true

1006 B Raw Blame History

Composer draft scrolling (14-line cap, two text layers, one scrollport)

At the start of the draft

Scrolled to the end of the draft

Draft ending in a newline, scrolled to the end

Right after pasting a long block at the end

1006 B

Raw Blame History