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Fix setWindowVisibility() being a no-op for OSR/windowless browsers - #41
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## master #41 +/- ##
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+ Coverage 38.01% 38.04% +0.02%
- Complexity 735 736 +1
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Files 243 244 +1
Lines 14863 14881 +18
Branches 2449 2451 +2
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+ Hits 5650 5661 +11
- Misses 8011 8014 +3
- Partials 1202 1206 +4 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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preliminary update racing ahead of onBeforeDownload CefDownloadItemTest.cancelDuringDownloadInvokesNCancel() flaked intermittently in CI across multiple unrelated backport PRs (#38, #39, #41, #42), always failing the same assertion: "onBeforeDownload was never invoked". Root-caused by reproducing it locally (100% deterministic once a low-risk, narrowly-scoped repro was possible -- see PR #44's run_tests.sh fix, needed first to run just this one test without also running the whole suite + leak-sweep) and adding temporary native fprintf instrumentation (not included in this commit) at DownloadHandler::OnBeforeDownload/ OnDownloadUpdated and ClientHandler::GetDownloadHandler. That instrumentation showed CEF can deliver a preliminary OnDownloadUpdated() notification -- for a valid, real CefDownloadItem -- *before* OnBeforeDownload() has been dispatched to the handler at all. This test's onDownloadUpdated() used to treat "not complete" on the very first update it saw as "must actively cancel it", immediately calling callback.cancel() and terminateTest() -- racing ahead of onBeforeDownload and ending the test before it ever got a chance to run, which is exactly what "onBeforeDownload was never invoked" captures. Fix: ignore any onDownloadUpdated() notification that arrives before this handler's own onBeforeDownload() has recorded its decision (gotBeforeDownload[0]). Verified via direct reproduction: failed 3/3 in isolation before the fix (including against a heavily-used local CEF profile where it failed 100% of the time), passed cleanly every time after (5+ consecutive solo runs, plus the full class together) with no change to downloadCompletesAndWritesRealFile's behavior. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01HBFmQs6JDypYP5qdC99yDq
N_SetWindowVisibility's whole body was gated on OS_MACOSX, and even there only ran when windowed (IsWindowRenderingDisabled() check was backwards for that macOS branch's intent) -- so on every platform, for every OSR browser (useOSR=true, which is nearly all of ours), setWindowVisibility() has always silently done nothing. Windowless browsers have no native window for the OS-level toggle; CefBrowserHost::WasHidden() is CEF's own signal for this case (pauses/resumes rendering and GPU resource usage). Found by mining DanielTM999/java-cef (a sibling fork of chromiumembedded/java-cef), commit 6bd0cca ("OSR: WasHidden on setWindowVisibility for windowless browsers") -- confirmed the same bug exists here and adapted the fix. Adds CefBrowserWindowVisibilityTest as smoke coverage (the internal paused/resumed rendering state isn't observable from the Java side, so this asserts non-throwing rather than the rendering-pause effect directly). Verified against a full local suite run: 124/124 passing. Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01HBFmQs6JDypYP5qdC99yDq
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Summary
N_SetWindowVisibility's whole body was gated onOS_MACOSX, and even there only ran when windowed (theIsWindowRenderingDisabled()check was backwards for that branch's intent) -- so on every platform, for every OSR browser (useOSR=true, nearly all of ours),setWindowVisibility()has always silently done nothing.CefBrowserHost::WasHidden()is CEF's own signal for this case (pauses/resumes rendering and GPU resource usage).DanielTM999/java-cef(a sibling fork ofchromiumembedded/java-cef), commit6bd0cca1("OSR: WasHidden on setWindowVisibility for windowless browsers") -- confirmed the same bug exists here and adapted the fix.Test plan
CefBrowserWindowVisibilityTestas smoke coverage -- the internal paused/resumed rendering state isn't observable from the Java side, so this asserts non-throwing rather than the rendering-pause effect directly.libjcef.socleanly (ninja jcef), zero compile errors.Small, focused backport of a single self-contained fix (no other changes bundled in), following the same shape as PR #1, #36-#40.
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https://claude.ai/code/session_01HBFmQs6JDypYP5qdC99yDq