Source Switcher should be disabled while walkthrough is active

[bhousel]

I know that the source switcher is mostly for local iD installs for debugging, but clicking it while the walkthrough is active throws away the walkthrough graph.

[bhousel]

For anyone who wants to work on this - it's real easy!
Just add a if (context.inIntro()) return; right after the d3_event.preventDefault(); line.
This will make the button do nothing if the tutorial is active..

iD/modules/ui/source_switch.js

Lines 14 to 31 in dd40dd5

	function click() {
	d3_event.preventDefault();
	if (context.history().hasChanges() &&
	!window.confirm(t('source_switch.lose_changes'))) return;
	var live = d3_select(this)
	.classed('live');
	context.history().clearSaved();
	context.connection().switch(live ? keys[1] : keys[0]);
	context.enter(modeBrowse(context));
	context.flush();
	d3_select(this)
	.text(live ? t('source_switch.dev') : t('source_switch.live'))
	.classed('live', !live);
	}

[mauzzr]

I'm on it!