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Tommaso Bianchi
cdd41e230d
Building the Design tab on first use (1750c52211) leaves m_design_panel null
until a human selects the tab. McpControl::handle_on_main refused every verb
while it was null, so start_mcp_control_if_enabled() opened the socket and
then answered "Design panel not ready" to everything — for the whole session
if nobody clicked. That is precisely the headless case the socket exists for:
the click-test rig drives this app over it with no window manager and no user.
MainFrame::ensure_design_panel() now builds the panel on demand and returns
it; the tab activation and the MCP dispatcher both go through it, so there is
one construction site rather than two. Safe to build wx controls there: that
handler is dispatched on the main thread by CallAfter, as its own comment
says.
The startup saving is untouched — a launch that never opens the tab and never
speaks MCP still builds nothing.
Verified: libslic3r_gui builds clean 745/745; fork parity green with snaporca,
which carries the same fix (McpControl.cpp is a byte-identical shared source).