Ψ-W1-T4: resolve drop targets per move, not once — every surface gets a defined outcome, a cue, and no silent no-op

src/shell/actions/instrument_drop_win.cpp

@@ -12,7 +12,7 @@
 #include <vector>
 
 #include "core/version/app_version.h"      // vstPluginName() — the CHANNEL-correct FX name (stable/beta pairing)
-#include "core/wire/instrument_drop.h"  // infoNamesFxHotspot — the PURE, unit-tested hotspot classifier
+#include "core/wire/instrument_drop.h"  // classifyReaperSurface — the PURE, unit-tested classifier
 
 #include "reaper_plugin.h"
 
@@ -33,7 +33,7 @@ using version::vstPluginName;
 using wire::decideDropOutcome;
 using wire::DropAttempt;
 using wire::DropOutcome;
-using wire::infoNamesFxHotspot;
+using wire::classifyReaperSurface;
 
 namespace {
 
@@ -76,17 +76,14 @@ std::filesystem::path writeTempPreset(const std::vector<std::uint8_t>& bytes) {
 
 }  // namespace
 
-FxDropTarget resolveFxDropTarget(int screenX, int screenY) {
-    FxDropTarget out;
+DropProbe probeDropTarget(int screenX, int screenY) {
+    DropProbe out;
     char info[256] = {0};
-    // A non-empty info OR a non-null track means the point is over REAPER's own UI;
-    // a null track with empty info means the pointer has left REAPER entirely.
-    MediaTrack* track = GetThingFromPoint(screenX, screenY, info, sizeof(info));
-    out.track = track;
-    out.overReaperUi = (track != nullptr) || (info[0] != '\0');
-    // The hotspot is either the FX chain/floating window ("fx_*") OR the FX-button family of
-    // the track/mixer panel ("tcp.fx*"/"mcp.fx*"). The pure classifier owns the rule.
-    out.overFxHotspot = (track != nullptr) && infoNamesFxHotspot(info);
+    // GetThingFromPoint may return a null track together with a valid info string (its own
+    // doc-comment says so), so the track and the surface are two independent facts and both
+    // are reported. The pure classifier owns every token rule.
+    out.track = GetThingFromPoint(screenX, screenY, info, sizeof(info));
+    out.surface = classifyReaperSurface(info, out.track != nullptr);
     return out;
 }