fix: 🐛 press m & move w/ arrows

tests/apps/Makefile.wasm

@@ -186,7 +186,8 @@ all: minimal_test.html \
      $(S)/coroutine-pthread/nested_repro_ex.html \
      $(S)/coroutine-pthread/vcall_repro.html \
      $(S)/textctrl-reentry/textctrl-reentry_test.html \
-     $(S)/tooltip-lifetime/tooltip-lifetime_test.html
+     $(S)/tooltip-lifetime/tooltip-lifetime_test.html \
+     $(S)/warp-pointer/warp-pointer_test.html
 
 # Main test app
 minimal_test.o: minimal_test.cpp
@@ -216,6 +217,15 @@ $(S)/tooltip-lifetime/tooltip-lifetime_test.html: $(S)/tooltip-lifetime/tooltip-
 
 tooltip-lifetime: $(S)/tooltip-lifetime/tooltip-lifetime_test.html
 
+# wxWindow::WarpPointer must update the cached mouse position (wxGetMousePosition).
+$(S)/warp-pointer/warp-pointer_test.o: $(S)/warp-pointer/warp-pointer_test.cpp
+	$(CXX) -c $(CXXFLAGS) $< -o $@
+
+$(S)/warp-pointer/warp-pointer_test.html: $(S)/warp-pointer/warp-pointer_test.o $(WX_CORE_LIB) $(JS_FILES)
+	$(CXX) $< $(LDFLAGS_NOGL) --pre-js $(JS) --shell-file $(HTML) -o $@
+
+warp-pointer: $(S)/warp-pointer/warp-pointer_test.html
+
 # Menu test (no GL)
 $(S)/menu/menu_test.o: $(S)/menu/menu_test.cpp
 	$(CXX) -c $(CXXFLAGS) $< -o $@

tests/apps/standalone/warp-pointer/warp-pointer_test.cpp

@@ -0,0 +1,93 @@
+// wxWindow::WarpPointer must update the cached mouse position (DOM port).
+//
+// Bug (src/wasm/window.cpp): wxWindowWasm::WarpPointer() is a no-op because the
+// browser cannot move the OS pointer. KiCad nudges the cursor with the arrow
+// keys by warping the pointer and then reading it back via wxGetMousePosition()
+// (WX_VIEW_CONTROLS::SetCursorPosition -> WarpMouseCursor -> WarpPointer, then
+// the interactive-move loop reads GetViewControls()->GetMousePosition()). With
+// the warp a no-op the cached position never changes, so a selected item never
+// follows the arrow keys and snaps to the stale cursor on grab.
+//
+// The invariant the bug violates: after WarpPointer(x, y), wxGetMousePosition()
+// must report the screen-space equivalent of (x, y) — exactly what a real OS
+// pointer warp produces on desktop.
+//
+//   RED  (bug present): wxGetMousePosition() is unchanged by the warp.
+//   GREEN (fixed):      wxGetMousePosition() == ClientToScreen({x, y}).
+
+#include "wx/wxprec.h"
+#ifndef WX_PRECOMP
+    #include "wx/wx.h"
+#endif
+
+#ifdef __EMSCRIPTEN__
+#include <emscripten/emscripten.h>
+#endif
+
+static void Report(const char *name, bool pass, const wxString &detail)
+{
+#ifdef __EMSCRIPTEN__
+    EM_ASM({
+        var msg = '[REPRO] ' + UTF8ToString($0) + ': ' + ($1 ? 'PASS' : 'FAIL')
+                  + ' - ' + UTF8ToString($2);
+        if ($1) { console.log(msg); } else { console.error(msg); }
+    }, name, pass ? 1 : 0, (const char *)detail.utf8_str());
+#endif
+}
+
+class ReproFrame : public wxFrame
+{
+public:
+    ReproFrame();
+
+private:
+    void RunTest();
+};
+
+ReproFrame::ReproFrame()
+    : wxFrame(nullptr, wxID_ANY, "wxWindow::WarpPointer repro")
+{
+    CallAfter(&ReproFrame::RunTest);
+}
+
+void ReproFrame::RunTest()
+{
+    // Two distinct targets so a stale/default cached position cannot accidentally
+    // match. Warp to each, then require wxGetMousePosition() to report the
+    // screen-space equivalent (the same conversion a real OS warp performs).
+    const wxPoint targets[] = { wxPoint(137, 211), wxPoint(56, 92) };
+
+    bool allPass = true;
+    wxString detail;
+
+    for (const wxPoint &client : targets)
+    {
+        WarpPointer(client.x, client.y);
+
+        const wxPoint expected = ClientToScreen(client);
+        const wxPoint actual = wxGetMousePosition();
+        const bool pass = (actual == expected);
+        allPass = allPass && pass;
+
+        detail += wxString::Format("[client=(%d,%d) expected=(%d,%d) actual=(%d,%d) %s] ",
+                                   client.x, client.y, expected.x, expected.y,
+                                   actual.x, actual.y, pass ? "ok" : "MISMATCH");
+    }
+
+    Report("warppointer_updates_position", allPass, detail);
+}
+
+class ReproApp : public wxApp
+{
+public:
+    bool OnInit() override
+    {
+        if (!wxApp::OnInit())
+            return false;
+
+        (new ReproFrame())->Show(true);
+        return true;
+    }
+};
+
+wxIMPLEMENT_APP(ReproApp);