Remove references to old GPU preview feature.

webapp/src/App.vue

@@ -239,9 +239,7 @@ export default {
         this.$store.commit("changeWaiting", false);
       }
     },
-    handleExit: function () {
+    handleExit: function () {},
-      eventBus.emit("globalTogglePreview", false);
-    },
 
     /**
      *  Handle global mouse wheel events to be associated with navigation

webapp/src/components/tabContentComponents/streamContent.vue

@@ -98,8 +98,6 @@ export default {
   },
 
   beforeUnmount: function () {
-    // Remove global signal listener to change the GPU preview state
-    eventBus.off("globalTogglePreview", true);
     // Disconnect the size observer
     this.sizeObserver.disconnect();
     // Remove from the array of active streams

webapp/src/mixins/modalMixins.js

@@ -12,11 +12,6 @@ import { eventBus } from "@/eventBus";
 export default {
   methods: {
     modalConfirm: function (modalText) {
-      var context = this;
-
-      // Stop GPU preview to show modal
-      eventBus.emit("globalTogglePreview", false);
-
       // force OK to be capitalised
       UIkit.modal.i18n = { ok: "OK", cancel: "Cancel" };
 
@@ -32,10 +27,6 @@ export default {
             },
           )
           .finally(function () {
-            // Re-enable the GPU preview, if it was active before the modal
-            if (context.$store.state.autoGpuPreview) {
-              eventBus.emit("globalTogglePreview", true);
-            }
             eventBus.emit("modalClosed");
           });
       };

webapp/src/store.js

@@ -61,7 +61,6 @@ export default createStore({
     available: false,
     waiting: false,
     error: "",
-    autoGpuPreview: false,
     trackWindow: true,
     activeStreams: {},
     microscopeHostname: "",
@@ -95,9 +94,6 @@ export default createStore({
     changeDisableStream(state, disabled) {
       state.disableStream = disabled;
     },
-    changeAutoGpuPreview(state, enabled) {
-      state.autoGpuPreview = enabled;
-    },
     changeTrackWindow(state, enabled) {
       state.trackWindow = enabled;
     },