core: add confirmation prompt when executing clear command history

[vince-fugnitto]

Feature Description

The goal is to prompt end-users to confirm whether or not they want to actually clear their command history when executing the command Clear Command History. The confirmation will prevent clearing history accidentally for instance, and aligns with the behavior present in VS Code.

Related Code

Command Registration:

theia/packages/core/src/browser/quick-input/quick-command-frontend-contribution.ts

Lines 38 to 41 in 18b2503

	commands.registerCommand(CLEAR_COMMAND_HISTORY, {
	execute: () => commands.clearCommandHistory(),
	});
	}

ConfirmDialog:

Definition:

theia/packages/core/src/browser/dialogs.ts

Line 360 in 18b2503

export class ConfirmDialog extends AbstractDialog<boolean> {

Example Usage:

theia/packages/core/src/browser/dialogs.ts

Lines 394 to 402 in 18b2503

	export async function confirmExit(): Promise<boolean> {
	const safeToExit = await new ConfirmDialog({
	title: nls.localizeByDefault('Are you sure you want to quit?'),
	msg: nls.localize('theia/core/quitMessage', 'Any unsaved changes will not be saved.'),
	ok: Dialog.YES,
	cancel: Dialog.NO,
	}).open();
	return safeToExit === true;
	}

[helloworldmygithub]

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