visibleDate works incorrect if startDate is not provided

[chuckn0rris]

Forum post

To reproduce remove startDate/endDate configs and add visibleDate instead with any positioning (start, center...). It will not be working, a project will be auto positioned depends on events data set.
Try to specify visibleDate with startDate provided. All works as expected.

[chuckn0rris]

Code to reproduce. If you uncomment startDate, it will be working.

new Gantt({
    appendTo :  'container',

rowHeight         : 80,
height            : 200,

columns : [
    { type : 'name' }
],

features : {
    projectLines : false
},

viewPreset : {
    base      : 'weekAndDayLetter',
    tickWidth : 50
},

tasks : [
   { id : 1, name : 'Write docs 1', startDate : '2017-01-02', endDate : '2017-01-06', leaf : true, percentDone : 50, manuallyScheduled: true },
{ id : 2, name : 'Write docs 2', startDate : '2017-06-10', endDate : '2017-06-16', leaf : true, percentDone : 50, manuallyScheduled: true },
{ id : 3, name : 'Write docs 3', startDate : '2017-11-02', endDate : '2017-11-06', leaf : true, percentDone : 50, manuallyScheduled: true },
{ id : 4, name : 'Write docs 4', startDate : '2015-01-02', endDate : '2018-02-06', leaf : true, percentDone : 50, manuallyScheduled: true },
{ id : 5, name : 'Write docs 5', startDate : '2016-03-02', endDate : '2018-03-06', leaf : true, percentDone : 50, manuallyScheduled: true },
{ id : 6, name : 'Write docs 6', startDate : '2017-04-02', endDate : '2018-04-06', leaf : true, percentDone : 50, manuallyScheduled: true }
    ],

assignments : [
    { id : 1, event : 1, resource : 1 },
    { id : 2, event : 1, resource : 2 }
],
// startDate : '2016-10-10',
// endDate : '2018-04-06',
visibleDate: {
  date: new Date("2017-01-02"),
  block: "center"
},
resources : [
    { id : 1, name : 'Celia Johnsson' },
    { id : 2, name : 'Lee Brook' },
    { id : 3, name : 'Macy von Schnitzel' }
],

// Custom task contents, showing initials of the assigned resources
taskRenderer({ taskRecord, renderData }) {
    // Return some custom elements, described as DomSync config objects.
    // Please see https://bryntum.com/docs/gantt/#Core/helper/DomHelper#function-createElement-static for more information.
    return [
        {
            html  : taskRecord.name,
            style : 'margin-bottom : 0.5em'
        },
        ...taskRecord.resources.map(resource => ({
            tag   : 'span',
            style : 'display:inline-block;font-size:0.8em;padding:0.4em;background:rgba(0,0,0,0.1);border-radius:50%;margin-right:0.3em',
            html  : resource.initials
        })
        )
    ];
}

> });