gui: a Command-click on the Mac's menu bar icon is left to the system, which drags the icon with it (#792, BennettChina) — Hidden Bar's users move icons with Command-drag, and magpie's icon opened its panel instead. The tray's click handler now reads the held modifiers ([NSEvent modifierFlags]) and does nothing when Command is down; other systems are unchanged. go vet, builds (darwin with the GUI, GOOS=linux nogui, GOOS=windows) and go test -tags nogui ./internal/gui/ under a temp HOME pass; the drag itself wasn't exercised here (it would move icons in the owner's live menu bar).

internal/gui/app.go

@@ -438,6 +438,9 @@ func Run(version string, showMain bool, link string) error {
 	// the quick panel by the icon, or the main window if the user would
 	// rather (Settings → Tray icon)
 	h.tray.OnClick(func() {
+		if cmdClick() {
+			return // Command-drag moves the icon; the system handles it
+		}
 		if runtime.GOOS == "darwin" {
 			go h.flap()
 		}

internal/gui/cmdheld_darwin.go

@@ -0,0 +1,19 @@
+//go:build !nogui
+
+package gui
+
+/*
+#cgo CFLAGS: -x objective-c
+#cgo LDFLAGS: -framework Cocoa
+#import <Cocoa/Cocoa.h>
+
+static int commandHeld(void) {
+	return ([NSEvent modifierFlags] & NSEventModifierFlagCommand) != 0;
+}
+*/
+import "C"
+
+// cmdClick says whether Command was held as the icon was clicked: the Mac
+// drags a menu bar icon with Command, so the click is the system's, not
+// magpie's (BennettChina, #792: Hidden Bar's users move icons so).
+func cmdClick() bool { return C.commandHeld() != 0 }

internal/gui/cmdheld_other.go

@@ -0,0 +1,6 @@
+//go:build !darwin && !nogui
+
+package gui
+
+// cmdClick: only the Mac drags its tray icons with a modifier.
+func cmdClick() bool { return false }