Add step to number setting inputbox (microsoft#167093)

Fixes microsoft#166897

Author: rzhao271

src/vs/base/browser/ui/inputbox/inputBox.ts

@@ -265,6 +265,14 @@ export class InputBox extends Widget {
 		}
 	}
 
+	public get step(): string {
+		return this.input.step;
+	}
+
+	public set step(newValue: string) {
+		this.input.step = newValue;
+	}
+
 	public get height(): number {
 		return typeof this.cachedHeight === 'number' ? this.cachedHeight : dom.getTotalHeight(this.element);
 	}

src/vs/workbench/contrib/preferences/browser/settingsTree.ts

@@ -1758,6 +1758,7 @@ export class SettingNumberRenderer extends AbstractSettingRenderer implements IT
 
 		template.onChange = undefined;
 		template.inputBox.value = dataElement.value;
+		template.inputBox.step = dataElement.valueType.includes('integer') ? '1' : 'any';
 		template.inputBox.setAriaLabel(dataElement.setting.key);
 		template.onChange = value => {
 			if (!renderValidations(dataElement, template, false)) {