Report the instrument's automatable parameters to the host under a frozen id table, in signal-flow order, with real units

42 of 44 ids issued: pitch key-track and Trigger length stay reserved
pending a live path. Master gain reclassified Live — it never reloaded.

src/shell/instrument/editor_platform.cpp

@@ -249,9 +249,7 @@ LRESULT CALLBACK ReaSamplerEditor::wndProc(HWND hwnd, UINT msg, WPARAM wParam,
                     // abandoned value indefinitely instead of rolling back.
                     const bool transient = self->drag_ == DragKind::kScrollThumb ||
                         (self->drag_ == DragKind::kDeckKnob &&
-                         (self->dragParamId_ == -2 ||
-                          self->dragParamId_ == static_cast<int>(ParamControl::kVoiceCount) ||
-                          self->dragParamId_ == static_cast<int>(ParamControl::kMasterGain)));
+                         ReaSamplerEditor::deckKnobIsProcessorSide(self->dragParamId_));
                     if (!transient) {
                         self->params_ = self->dragStartParams_;
                         // A live drag already reached the voices AND the processor's own
@@ -263,6 +261,10 @@ LRESULT CALLBACK ReaSamplerEditor::wndProc(HWND hwnd, UINT msg, WPARAM wParam,
                             self->commitLive();
                         }
                     }
+                    // Peer of onMouseUp's bracket close, and after the rollback for the same
+                    // reason: the rollback's own performEdit belongs inside the bracket the grab
+                    // opened, and an abandoned drag must not leave the host's edit open.
+                    if (self->processor_) self->processor_->endParamGesture();
                     self->drag_ = DragKind::kNone;
                     self->dragParamId_ = -1;
                     self->dragInnerCellId_ = -1;  // inner-dial drag state (peer reset)