Fix possible infinite loop on widget start

[toger5]

Fixes: element-hq/element-web#15494
The issue was caused because react reloads the component if the ref={this.iframeRefChange} callback throws an error. Catching the error prohibits the reload.
Previous behavior if sgwidget.start() throws an error:

• caught in infinite loop

New behavior if sgwidget.start() throws an error:

• the widgets does not display the loading indicator anymore
• an error is logged in the browser console
• The widget does not reload

Maybe we want a more specific error message in the widget Iframe? But since an error in the start function should not happen a log in the console might be sufficient.

---

Here's what your changelog entry will look like:

🐛 Bug Fixes

• Fix possible infinite loop on widget start (#7071). Fixes AppTile errors lead to infinite loops element-hq/element-web#15494 and AppTile errors lead to infinite loops element-hq/element-web#15494. Contributed by @toger5.

Preview: https://61825cefaf5e23b261f56701--matrix-react-sdk.netlify.app
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[turt2live]

otherwise lgtm - thanks!

[turt2live]

When we use blocks, we generally prefer to use the lines it gives us. Also, error for errors :)

Suggested change

	} catch (e) { logger.log("Failed to start widget", e); }
	} catch (e) {
	logger.error("Failed to start widget", e);
	}

[toger5]

Is it fine to than also change this to an error?

[turt2live]

Thanks!