Fix position of keyword in "Add 'override' modifier" code fix (microsoft#45274)

fixes microsoft#45270

Author: MartinJohns

src/compiler/factory/nodeTests.ts

@@ -129,6 +129,11 @@ namespace ts {
         return node.kind === SyntaxKind.StaticKeyword;
     }
 
+    /* @internal */
+    export function isAbstractModifier(node: Node): node is AbstractKeyword {
+        return node.kind === SyntaxKind.AbstractKeyword;
+    }
+
     /*@internal*/
     export function isSuperKeyword(node: Node): node is SuperExpression {
         return node.kind === SyntaxKind.SuperKeyword;

src/services/codefixes/fixOverrideModifier.ts

@@ -89,11 +89,13 @@ namespace ts.codefix {
         const classElement = findContainerClassElementLike(sourceFile, pos);
         const modifiers = classElement.modifiers || emptyArray;
         const staticModifier = find(modifiers, isStaticModifier);
+        const abstractModifier = find(modifiers, isAbstractModifier);
         const accessibilityModifier = find(modifiers, m => isAccessibilityModifier(m.kind));
-        const modifierPos = staticModifier ? staticModifier.end :
+        const modifierPos = abstractModifier ? abstractModifier.end :
+            staticModifier ? staticModifier.end :
             accessibilityModifier ? accessibilityModifier.end :
             classElement.decorators ? skipTrivia(sourceFile.text, classElement.decorators.end) : classElement.getStart(sourceFile);
-        const options = accessibilityModifier || staticModifier ? { prefix: " " } : { suffix: " " };
+        const options = accessibilityModifier || staticModifier || abstractModifier ? { prefix: " " } : { suffix: " " };
         changeTracker.insertModifierAt(sourceFile, modifierPos, SyntaxKind.OverrideKeyword, options);
     }
 

tests/cases/fourslash/codeFixOverrideModifier12.ts

@@ -11,6 +11,6 @@
 
 verify.codeFix({
     description: "Add 'override' modifier",
-    newRangeContent: "override abstract bar() {}",
+    newRangeContent: "abstract override bar() {}",
     index: 0
 })