small fix in instruments terminal window

Author: mvladic

packages/eez-studio-ui/_stylesheets/instrument.less

@@ -344,7 +344,6 @@
     max-width: calc(100% - 40px);
     pre {
         user-select: text;
-        max-height: 800px;
         overflow-y: auto;
         padding-right: 10px;
     }

packages/instrument/connection/connection-main.ts

@@ -274,6 +274,15 @@ export class Connection
 
     logAnswer(data: string) {
         if (this.traceEnabled && data.trim().length > 0) {
+            if (this.lastAnswerActivityLogId != undefined) {
+                const activityLog = activityLogStore.findById(
+                    this.lastAnswerActivityLogId
+                );
+                if (!activityLog || activityLog.deleted) {
+                    this.lastAnswerActivityLogId = undefined;
+                }
+            }
+
             if (this.lastAnswerActivityLogId != undefined) {
                 this.lastAnswerActivityLogMessage += data;