Fix the issue that dynamically updated disabled date doesn't update the central date

[ryubro]

What I did

In case the disabled dates of the calendar element in LionInputDatepicker changes dynamically (for instance, when two date pickers take start and end date from user, while start date changes the min value of the end date), the calendar's central date can be a disabled date and it doesn't get updated to the nearest enabled date.

This PR fixes the issue by getting nearest enabled date in case the initial central date becomes disabled.

Caveat

I introduced 10ms timeout in the test. await el.completeUpdate nor await el.{internal_node_getter}.completeUpdate didn't work because the date picker waits for its child node to be updated before it calls this._calendarNode.initCentralDate(). I even tried to wait the calendar node to complete updates multiple times but no luck. Please enlighten me if I can avoid using timeout.

[changeset-bot]

🦋 Changeset detected

Latest commit: 46a2b01

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@lion/ui	Patch

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[okadurin]

Please add a changeset

[okadurin]

Caveat

Just in case you want to avoid using setTimeout the test could be updated with closeCalendar/openCalendar as follows:

      it('should update the central date of Calendar if updated validator made the current central date disabled', async () => {
        const initialValidators = [new MaxDate(new Date('2000/01/01'))];
        const updatedValidators = [new MaxDate(new Date('2020/01/01'))];

        const el = await fixture(html`
          <lion-input-datepicker .validators="${initialValidators}"></lion-input-datepicker>
        `);
        const elObj = new DatepickerInputObject(el);
        await elObj.openCalendar();
        expect(getProtectedMembersDatepicker(el).calendarNode.centralDate.toString()).to.equal(
          new Date('2000/01/01').toString(),
        );

        await elObj.closeCalendar();
        el.validators = updatedValidators;
        await elObj.openCalendar();
        expect(getProtectedMembersDatepicker(el).calendarNode.centralDate.toString()).to.equal(
          new Date('2020/01/01').toString(),
        );
      });

[tlouisse]

I approved the pr 🥳 Do you not forget the changeset, to squash all commits and use a commit message like fix(calendar): align central date with dynamic disabled dates?