src/vs/workbench/services/keybinding/common/keymapInfo.ts/KeymapInfo/getScore
class KeymapInfo:	getScore(other: IRawMixedKeyboardMapping): number {
		let score = 0;
		for (const key in other) {
			if (isWindows && (key === 'Backslash' || key === 'KeyQ')) {
				// keymap from Chromium is probably wrong.
				continue;
			}

			if (isLinux && (key === 'Backspace' || key === 'Escape')) {
				// native keymap doesn't align with keyboard event
				continue;
			}

			const currentMapping = this.mapping[key];

			if (currentMapping === undefined) {
				score -= 1;
			}

			const otherMapping = other[key];

			if (currentMapping && otherMapping && currentMapping.value !== otherMapping.value) {
				score -= 1;
			}
		}

		return score;
	}