switch to a new layout only when the score is higher.

src/vs/workbench/services/keybinding/browser/keymapService.ts

@@ -154,7 +154,20 @@ export class BrowserKeyboardMapperFactoryBase {
 	}
 
 	setActiveKeyMapping(keymap: IKeyboardMapping | null) {
-		this._activeKeymapInfo = this.getMatchedKeymapInfo(keymap) || this.getUSStandardLayout();
+		let matchedKeyboardLayout = this.getMatchedKeymapInfo(keymap);
+		if (matchedKeyboardLayout) {
+			if (!this._activeKeymapInfo) {
+				this._activeKeymapInfo = matchedKeyboardLayout;
+			} else if (keymap) {
+				if (matchedKeyboardLayout.getScore(keymap) > this._activeKeymapInfo.getScore(keymap)) {
+					this._activeKeymapInfo = matchedKeyboardLayout;
+				}
+			}
+		}
+
+		if (!this._activeKeymapInfo) {
+			this._activeKeymapInfo = this.getUSStandardLayout();
+		}
 
 		if (!this._activeKeymapInfo) {
 			return;
@@ -348,7 +361,7 @@ export class BrowserKeyboardMapperFactoryBase {
 			const matchedKeyboardLayout = this.getMatchedKeymapInfo(ret);
 
 			if (matchedKeyboardLayout) {
-				return matchedKeyboardLayout.mapping;
+				return ret;
 			}
 
 			return null;

src/vs/workbench/services/keybinding/common/keymapInfo.ts

@@ -4,7 +4,7 @@
  *--------------------------------------------------------------------------------------------*/
 
 import { Event } from 'vs/base/common/event';
-import { isWindows } from 'vs/base/common/platform';
+import { isWindows, isLinux } from 'vs/base/common/platform';
 import { createDecorator, ServiceIdentifier } from 'vs/platform/instantiation/common/instantiation';
 import { DispatchConfig } from 'vs/workbench/services/keybinding/common/dispatchConfig';
 import { IKeyboardMapper } from 'vs/workbench/services/keybinding/common/keyboardMapper';
@@ -286,6 +286,12 @@ export class KeymapInfo {
 				// keymap from Chromium is probably wrong.
 				continue;
 			}
+
+			if (isLinux && (key === 'Backspace' || key === 'Escape')) {
+				// native keymap doesn't align with keyboard event
+				continue;
+			}
+
 			if (this.mapping[key] === undefined) {
 				score -= 1;
 			}