From bced3fffa1a3dd40272aeb9582347c00af48fa27 Mon Sep 17 00:00:00 2001
From: yuchao <yuchao.sydneyuni@gmail.com>
Date: Tue, 12 Oct 2021 10:22:34 +1100
Subject: [PATCH 1/3] fix(compiler): do not add if guard when condition is
 empty

---
 src/compiler/codegen/events.js | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/compiler/codegen/events.js b/src/compiler/codegen/events.js
index 4b0776115a0..0fb4263f197 100644
--- a/src/compiler/codegen/events.js
+++ b/src/compiler/codegen/events.js
@@ -130,12 +130,11 @@ function genHandler (handler: ASTElementHandler | Array<ASTElementHandler>): str
         }
       } else if (key === 'exact') {
         const modifiers: ASTModifiers = (handler.modifiers: any)
-        genModifierCode += genGuard(
-          ['ctrl', 'shift', 'alt', 'meta']
+        const condition = ['ctrl', 'shift', 'alt', 'meta']
             .filter(keyModifier => !modifiers[keyModifier])
             .map(keyModifier => `$event.${keyModifier}Key`)
-            .join('||')
-        )
+            .join('||');
+        if (condition) genModifierCode += genGuard(condition)
       } else {
         keys.push(key)
       }

From ae0d273c29b835c40b1f275c4081b387deceec92 Mon Sep 17 00:00:00 2001
From: yuchao <yuchao.sydneyuni@gmail.com>
Date: Tue, 12 Oct 2021 10:27:15 +1100
Subject: [PATCH 2/3] fix(compiler): remove semicolon

---
 src/compiler/codegen/events.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/codegen/events.js b/src/compiler/codegen/events.js
index 0fb4263f197..0a7ca394450 100644
--- a/src/compiler/codegen/events.js
+++ b/src/compiler/codegen/events.js
@@ -133,7 +133,7 @@ function genHandler (handler: ASTElementHandler | Array<ASTElementHandler>): str
         const condition = ['ctrl', 'shift', 'alt', 'meta']
             .filter(keyModifier => !modifiers[keyModifier])
             .map(keyModifier => `$event.${keyModifier}Key`)
-            .join('||');
+            .join('||')
         if (condition) genModifierCode += genGuard(condition)
       } else {
         keys.push(key)

From b0675cff5ce90f245e64834ff36bdd2ebf97cfe0 Mon Sep 17 00:00:00 2001
From: yuchao <yuchao.sydneyuni@gmail.com>
Date: Tue, 12 Oct 2021 20:52:19 +1100
Subject: [PATCH 3/3] fix(compiler): add unit test

---
 test/unit/modules/compiler/codegen.spec.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test/unit/modules/compiler/codegen.spec.js b/test/unit/modules/compiler/codegen.spec.js
index d7faa204944..4add1d06ecb 100644
--- a/test/unit/modules/compiler/codegen.spec.js
+++ b/test/unit/modules/compiler/codegen.spec.js
@@ -430,6 +430,14 @@ describe('codegen', () => {
     )
   })
 
+  // GitHub Issues #12319
+  it('generate events with ctrl shift alt meta exact modifiers are applied together', () => {
+    assertCodegen(
+      '<button @keydown.ctrl.shift.alt.meta.exact="onClick">Click</button>',
+      `with(this){return _c('button',{on:{"keydown":function($event){if(!$event.ctrlKey)return null;if(!$event.shiftKey)return null;if(!$event.altKey)return null;if(!$event.metaKey)return null;return onClick.apply(null, arguments)}}},[_v("Click")])}`
+    )
+  })
+
   it('generate events with mouse event modifiers', () => {
     assertCodegen(
       '<input @click.ctrl="onClick">',