Trigger typeahead on Ctrl-Space

public/app/containers/Explore/QueryField.tsx

@@ -335,20 +335,30 @@ class QueryField extends React.Component<any, any> {
   }
 
   onKeyDown = (event, change) => {
-    if (this.menuEl) {
     const { typeaheadIndex, suggestions } = this.state;
 
     switch (event.key) {
       case 'Escape': {
         if (this.menuEl) {
           event.preventDefault();
+          event.stopPropagation();
           this.resetTypeahead();
           return true;
         }
         break;
       }
 
+      case ' ': {
+        if (event.ctrlKey) {
+          event.preventDefault();
+          this.handleTypeahead();
+          return true;
+        }
+        break;
+      }
+
       case 'Tab': {
+        if (this.menuEl) {
           // Dont blur input
           event.preventDefault();
           if (!suggestions || suggestions.length === 0) {
@@ -364,18 +374,24 @@ class QueryField extends React.Component<any, any> {
           this.applyTypeahead(change, suggestion);
           return true;
         }
+        break;
+      }
 
       case 'ArrowDown': {
+        if (this.menuEl) {
           // Select next suggestion
           event.preventDefault();
           this.setState({ typeaheadIndex: typeaheadIndex + 1 });
+        }
         break;
       }
 
       case 'ArrowUp': {
+        if (this.menuEl) {
           // Select previous suggestion
           event.preventDefault();
           this.setState({ typeaheadIndex: Math.max(0, typeaheadIndex - 1) });
+        }
         break;
       }
 
@@ -384,7 +400,6 @@ class QueryField extends React.Component<any, any> {
         break;
       }
     }
-    }
     return undefined;
   };