root6 musrview could save the plot as png/pdf/svg/...; the ROOT7 web
rewrite dropped that. Add a "Save graphics" toolbar entry: the server
renders the classic layout (same code path as --png/--pdf/... batch
export) into the current working directory and hands it to the browser
as a download, so the browser's own save dialog/download folder decides
where it lands -- a native OS folder picker isn't reachable from here,
since the --embedded window is a Qt6 QWebEngineView owned by ROOT itself,
which auto-accepts downloads with no dialog.
Also fixes rasterized batch export (png/gif/jpg) coming out blank when
triggered from an already-running interactive session: TCanvas decides
at *construction* time, from gROOT->IsBatch(), whether to build a real
GUI canvas or a headless one, so canvas.SetBatch(kTRUE) after the fact
was too late. Vector formats (pdf/eps/svg) don't need pixel readback and
were unaffected, which is why this went unnoticed. Fixed by toggling
gROOT's batch flag for the export canvas's lifetime.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017cuZPrSNaKjG8xHPVNwV16
suter_aandClaude Sonnet 5
7a3fa94270