feat: improvements for tabs removement

[smsochneg]

Improvement for tabs removement behavior.
When user presses backspace in the beginning of tab title - it removes current tab and panel associated with it.
Also activating a tab next to it and panel associated with it

[d3m1d0v]

Suggested change

	content: 'yfm_tabs_list{1,} yfm_tab_panel{1,}',
	content: 'yfm_tabs_list yfm_tab_panel+',

[d3m1d0v]

Suggested change

	.addPlugin(() =>
	keymap({
	Backspace: tabPanelBackspace,
	}),
	)
	.addPlugin(() =>
	keymap({
	Backspace: tabBackspace,
	}),
	);
	.addKeymap(() => ({
	Backspace: chainCommands(tabPanelBackspace, tabBackspace),
	}));

[yc-ui-bot]

Preview is ready.

[d3m1d0v]

Suggested change

	const tabPanel = findParentNodeOfType(tabPanelType(state.schema))(state.selection);
	if (
	tabPanel &&
	state.selection.from === tabPanel.pos + 2 &&
	state.selection.to === state.selection.from
	) {
	return true;
	}
	return false;
	const $cursor = get$Cursor(state.selection);
	if($cursor?.node($cursor.depth - 1).type === tabPanelType(state.schema) && $cursor.start($cursor.depth - 1) === $cursor.pos - 1) {
	return true;
	}
	return false;