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fix(export): VK Android viewer+clipboard; no share title on iOS
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Round-5 on-device findings:

- VK Android's DownloadFile hangs regardless of Content-Length and
  Range/206 (PNG stalls ~80%, GCG at 0%) — the download route is
  abandoned there: the PNG opens in VK's native image viewer
  (VKWebAppShowImages — its save works on-device) and the GCG returns
  to the clipboard copy (the pre-URL route, always solid). VK iOS keeps
  VKWebAppDownloadFile (verified perfect); the desktop iframe keeps
  plain anchor downloads.
- The iOS share sheet no longer carries a title: iOS pasted the
  'game-<hash>.png' filename as accompanying text next to the image.
This commit is contained in:
Ilia Denisov
2026-07-02 23:32:52 +02:00
parent 8db18f2a2a
commit 77f222c209
7 changed files with 59 additions and 21 deletions
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docs/UI_DESIGN.md
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@@ -414,10 +414,12 @@ enabled on the first, uncached load) and flip in place when an event refreshes t
both options need the connection). Both formats mint the same signed relative link
(`game.export_url`), resolved against the app's own origin, then delivered per platform
(each branch owner-verified on-device): TG Android/desktop `downloadFile` (its preview
shares onwards); TG iOS the OS share sheet with the fetched file; VK mobile
`VKWebAppDownloadFile` for both formats (VK's native share/preview flow), the VK desktop
iframe plain anchor downloads; a mobile browser the OS share sheet (the proven
fetch-then-share pattern); a desktop browser an anchor download. A legacy Telegram
shares onwards); TG iOS the OS share sheet with the fetched file; VK iOS
`VKWebAppDownloadFile` for both formats (VK's native share flow); VK Android — whose
DownloadFile hangs — the PNG in VK's native image viewer (`VKWebAppShowImages`, its save
works) and the GCG to the clipboard; the VK desktop iframe plain anchor downloads; a
mobile browser the OS share sheet (the proven fetch-then-share pattern); a desktop
browser an anchor download. A legacy Telegram
client without `downloadFile` keeps the old GCG clipboard copy, hides the image option
and stays on the app modal. Confirming a resign reveals the full board: it closes the
history drawer (portrait) and zooms the board out.