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The fix before this made site-relative images zoomable by resolving them
against the article's own address. It left the parameter optional, which leaves
the bug one forgetful call site away from coming back -- and coming back
silently, as every image on a site-relative feed quietly refusing to zoom,
which is exactly how it went unnoticed on Ftrain in the first place.
It has no default now. Null is still a legitimate answer, because an article
with no address genuinely cannot resolve anything, but it has to be given on
purpose. A future reader surface that omits it fails to compile rather than
shipping the old behaviour.
Nothing about what the app does changed: the same 157 tests pass, and the six
test call sites that relied on the default now say baseUrl = null, which is
what they always meant.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B
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Tapping an image in a Ftrain article did nothing. The zoom affordance was
there, and the rendering path was the ordinary one -- the feed's own HTML, with
reader mode off -- but a tap went nowhere at all.
Tap detection works by wrapping every article image in a link to a scheme
nothing can navigate to, which the WebView then hands to
shouldOverrideUrlLoading. That href has to carry the complete image URL on its
own, so an image whose src was relative got no wrapper and no tap: better an
image that can't be zoomed, the reasoning went, than a link that goes nowhere.
Ftrain's <content:encoded> is entirely site-relative -- every image in it is
src="/art/uploads/..." -- so not one of them was zoomable.
That reasoning had an unexamined premise. The page itself resolves those srcs
perfectly well, against the base URL loadReaderHtml already hands
loadDataWithBaseURL: the article's own link. Resolving them the same way at
HTML-assembly time produces exactly the URL the WebView went and fetched, so
the wrapper can be built after all. Both reader surfaces now pass that base URL
down to the zoom pass. Where there genuinely is no base URL to resolve
against -- nothing else in the app loads reader HTML without one today -- the
old behavior stands and the image stays un-zoomable rather than acquiring a
dead link, and a data: or javascript: src is still refused however it was
reached, since the viewer could never open one.
This is why the report could only have come from a feed with reader mode off.
Reader mode never hits it: Readability rewrites every src to an absolute URL
before the extracted HTML reaches us, which is also why the same images zoom
fine the moment the feed's reader toggle is on.
TDD: site-relative and path-relative resolution, and the whole trip through
wrapReaderHtml, were written first against the unused parameter and went red on
assertion mismatches (3 of 38 in ImageZoomTest), green on the resolution
itself. The data:-src case was written at the same time and passed immediately
-- it pins existing behavior against the new code path rather than having
driven it.
Verified on the emulator against the reported article itself, subscribed live
from ftrain.com/feed.xml with reader mode off: on the previous build, a tap on
the header image left the screen byte-identical; on this one the same tap at
the same point opens the full-screen viewer.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B
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Peter, three builds running: audio plays, YouTube's title, controls and
scrubber thumbnails all draw, and where the picture belongs there is a
blank rectangle.
None of my guesses were right. It is not the embed, not the window, and
not the surface. It is layout. YouTube's player sizes itself with
`body { position: absolute; height: 100% }`, and in this WebView
percentage heights resolve against a containing block of zero height.
Measured in the running app: window.innerHeight correctly reports 214,
while 100vh and every percentage height resolve to 0. The body
collapsed, the player chain under it collapsed, and the video element
was laid out 380x0.
That explains the whole symptom, including the part I kept failing to
account for. The page, the chrome and the stream were all healthy --
the picture simply had nowhere to go, and what showed through the
zero-height player was YouTube's own white <html> background.
So the fix pins the player chain to the pixel height the page does
know and dispatches a resize so YouTube's own code re-measures.
Verified on a device, with the shipped code and nothing injected by
hand: the video element goes 380x0 -> 380x214 and the video plays.
Two things ruled out along the way, recorded so they are not retried:
hardware-accelerating the dialog's window changed nothing, and nor did
moving the player out of a dialog into an in-window overlay. An A/B
against BrowserScreen looked decisive for the window and was not --
that WebView differs in layout too, and layout was the real variable.
This treats the symptom. Why the viewport has no height is below this
app, in WebView.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B
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Peter, on the previous build: "the inline player now plays the audio but
the video is a black screen." So Error 153 is gone and the stream is
decoding -- what is left is a display problem.
The iframe was not needed in the first place. A `Referer` header alone
satisfies the embed, which means the player can be the WebView's own
ordinary top-level document again. That drops two constructs the last
build added: a `loadDataWithBaseURL` page, whose origin is synthetic,
and a cross-origin subframe inside it. Both have a history of rendering
video oddly in WebView, and the black screen appeared with them.
Measured on an Android user agent -- no referrer: Error 153; `&origin=`
in the query: Error 153; inside an iframe: plays; with a `Referer`
header: plays. The referrer is a constant on a reserved `.invalid`
domain rather than the article's URL, so YouTube learns which app asked
and nothing about what is being read -- the same reason the nocookie
domain is used.
Confirmed in the app's own WebView: the embed loads with no error,
854x480, readyState 4, playing.
NOT confirmed: that a picture now reaches the screen. This emulator
cannot render video in a WebView at all -- it hard-crashed the AVD
twice, including on a plain <video> in an ordinary non-dialog WebView --
so the one thing that matters here can only be checked on real
hardware.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B
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Three reported bugs.
**"West Hawaii today articles get a bunch of stray Trending headers."**
The publisher's widget platform injects promo blocks between the real
paragraphs, inside the article's own container, so every structural
signal tells Readability they belong. What survives is a heading
labelling nothing, because the links under it are filled in by a script
that never runs in the reader. Confirmed on 9 of the 12 articles in
that feed, two each. Blocks marked `data-mrf-recirculation` are now
removed -- the attribute says what the block is for in the widget
platform's own words, which is a better signal than the word
"Trending", since an article may legitimately discuss what is trending.
Nothing longer than a label and a few headlines is ever removed. Also
applied to already-cached articles, in place rather than by discarding
them: the article was fine, only the litter has to go.
**"Can't subscribe to heathercoxrichardson.substack.com."** Adding a
feed handed whatever URL it was given straight to the XML parser, so a
site's home page -- the only URL a reader can actually see and copy --
failed on the root element. That page advertises its feed the way sites
have since 2002, in a <link rel="alternate"> in the head. It is now
read, resolved against the page, and fetched. Only what the page
declares: guessing /feed and /rss would add a burst of 404s to every
failed add and eventually subscribe somebody to the wrong thing.
**"YouTube play is misconfigured."** It was, and YouTube said so: the
player dialog loaded the embed as its own top-level document, which
answers with "Video player configuration error -- Error 153". An embed
has to be embedded. It now sits in an iframe on a minimal host page.
Measured in the app's own WebView: top-level, no requests for the video
stream and the error on screen; framed, the stream loads and there is
no error.
**"Long click on YouTube placeholder should open the URL directly."**
It does now. Worth recording why this is not simply the link's href:
for an image inside a link, WebView's hit test reports the image's URL,
so a long-press on the thumbnail arrives as the i.ytimg.com JPEG. The
video id is resolved out of that.
Verified on a device for all four: the Substack site URL adds "Letters
from an American" and fetches 20 articles; a West Hawaii Today article
extracts with no Trending headers and its body intact; the video plays;
and a long-press reaches the YouTube app.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018AwnALZL6bD4VBtATDVv3B
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Reported against lcamtuf's Substack ("we should render tex",
blog.coredump.cx/p/yours-truly): reader mode showed raw
"\(p = \text{...}\)" where equations should be.
What the page actually ships is the TeX SOURCE, as text, inside a
"latex-rendered" div -- Substack renders it in the browser with its own
script, which never runs here. Readability keeps that text verbatim (it
strips the class, not the text), so nothing was being discarded during
extraction and no amount of extraction-side repair would have helped:
there was simply never any rendered markup to keep.
So render it during extraction, where JavaScript is already running for
Readability's sake. KaTeX (vendored in assets, never fetched -- this
runs against untrusted third-party pages) converts each expression to
MathML before Readability sees the document, and the reader WebView
renders that natively. The reader keeps JavaScript OFF, as it must, and
needs no stylesheet, webfont or script of KaTeX's; the only reader-side
change is containing a wide equation so it scrolls within its own box
instead of dragging the whole article sideways.
Two details worth knowing:
- KaTeX refuses {align} outside display mode, and Substack wraps display
maths in INLINE delimiters (a block-styled span does the centring), so
a mode that renders nothing is retried in the other one. An expression
neither mode can render is left as source -- no worse than before.
- The reported article came with "extractedContent cached: true", so the
raw source was already on disk and every open read it back. Recognised
and dropped on read (same mechanism as the cached consent notice),
which re-extracts the article the next time it is opened.
APK grows by ~90KB: the vendored katex.min.js (267KB) compresses to 91KB
in the APK. No new permissions, no schema change, no new JS-enabled
surface.
Verified on the emulator against the live article: stale raw-TeX cache
discarded, article re-extracted, all four equations rendered, and a wide
align block scrolls inside itself.
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Pinching in the reader used to scale the whole WebView like a photo and snap
back to the real font size on release. It now drives WebSettings.textZoom as
the fingers move, so the text itself resizes and reflows during the gesture
with nothing to snap back from; images and margins stay put. The reload at the
new saved size is what returns textZoom to 100%, so the two never overlap --
and loading reader HTML now goes through ReaderWebView.loadReaderHtml, which
does both together, so a future load site can't forget the reset.
Reader view for a tapped link now honors the saved font size and the same
pinch gesture, instead of always rendering at the 18px default.
A zoomed image can be panned again. The viewer computed its pan bounds from
values captured when the dialog first composed -- an empty viewport around a
not-yet-decoded image -- because a pointerInput(Unit) block keeps the lambda it
was created with. Those bounds allowed exactly one offset, 0, so zooming worked
and dragging did nothing. The whole pinch/pan step is now one pure function the
gesture callback calls with values it reads fresh each time.
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Article images could be looked at but never enlarged -- a photo or a
chart in a feed was stuck at whatever size the reader column gave it.
Tapping one now opens a full-screen viewer: pinch to zoom (up to 6x),
double-tap to toggle between fitted and 3x, drag to pan while zoomed,
and dismiss with back, the close button, or a swipe down.
Detecting the tap is the whole difficulty. The reader is a WebView, and
its JavaScript is off deliberately (untrusted article content), so no
in-page script can notice a tap on an <img> and report it out. WebView's
own built-in zoom isn't the answer either: pinching in the reader is
already taken, on purpose, by the reader-font-size gesture, and page
zoom scales the article's whole layout rather than giving an image the
screen. So wrapReaderHtml now wraps every image that isn't already
inside a link in a link to a scheme nothing can navigate to
(feedreader-image:<url>), which WebView hands to shouldOverrideUrlLoading
-- the interception point that already routes ordinary links and YouTube
thumbnails. The new onImageTap callback opens ImageZoomDialog instead of
following it.
Images that already sit inside a link are left alone: ReaderExtractor's
synthesized YouTube thumbnail is exactly that shape, and re-wrapping it
would swallow the tap that plays the video. Those stay zoomable from the
other side -- a link pointing straight at an image file is also treated
as a zoom target, which additionally fixes WordPress's default "link to
media file" markup sending a tap off to LinkReaderScreen to run
Readability over a JPEG. The long-press-link handler strips the scheme
back off, so the actions menu still offers the real image URL.
The viewer is Compose + Coil (AsyncImage), matching what the article
list's thumbnails already use, so a just-scrolled-past image usually
comes straight from Coil's cache; zoom is a graphicsLayer transform, not
a re-decode. Panning is bounded by where the image actually is rather
than by the viewport -- ContentScale.Fit letterboxes anything that isn't
the screen's aspect ratio, and bounding by the viewport would let a wide
photo be dragged up into its own black bar. Coil reports the intrinsic
size once decoded; until then the viewport is the fallback bound.
TDD: the HTML rewriting (linkifyImagesForZoom), the tap-target decision
(zoomableImageTarget), and the zoom/pan math (imageZoomScale,
imageZoomDoubleTapScale, clampImagePanOffset, fittedImageSize) were all
written test-first against stubs, red on assertion mismatches, green on
the real implementations -- 26 new cases in ImageZoomTest, including
three over wrapReaderHtml itself to pin the ordering that keeps the
YouTube thumbnail's link intact. Gesture wiring and the dialog itself
are Compose UI, untestable here for the same reason the rest of ui/ is.
Coverage is unchanged: ui/ is excluded from the Jacoco metric by design.
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