fix(segmentation): Restored segment label tool in longitudinal mode. (#5443)

extensions/cornerstone/src/commandsModule.ts

@@ -1858,13 +1858,21 @@ function commandsModule({
         }
       });
     },
-    toggleSegmentLabel: ({ enabled }) => {
+    toggleSegmentLabel: ({ enabled }: { enabled?: boolean }) => {
       const toolName = cornerstoneTools.SegmentLabelTool.toolName;
       const toolGroupIds = toolGroupService.getToolGroupIds();
 
+      const isToolOn = toolGroupIds.some(toolGroupId => {
+        const toolGroup = cornerstoneTools.ToolGroupManager.getToolGroup(toolGroupId);
+        const mode = toolGroup.getToolInstance(toolName)?.mode;
+        return mode === 'Active';
+      });
+
+      const enableTool = enabled !== undefined ? enabled : !isToolOn;
+
       toolGroupIds.forEach(toolGroupId => {
         const toolGroup = cornerstoneTools.ToolGroupManager.getToolGroup(toolGroupId);
-        if (enabled) {
+        if (enableTool) {
           toolGroup.setToolActive(toolName);
         } else {
           toolGroup.setToolDisabled(toolName);