When you take a look in the code of this base component, you will find this method:
onFocusLeave: function(e) {
this.collapse();
this.callParent([e]);
},
https://docs.sencha.com/extjs/6.5.3/classic/src/Picker.js.html
This method will call the collapse method which will hide the picker:
/**
* Collapses this field's picker dropdown.
*/
collapse: function() {
var me = this;
if (me.isExpanded && !me.destroyed && !me.destroying) {
var openCls = me.openCls,
picker = me.picker,
aboveSfx = '-above';
// hide the picker and set isExpanded flag
picker.hide();
me.isExpanded = false;
// remove the openCls
me.bodyEl.removeCls([openCls, openCls + aboveSfx]);
picker.el.removeCls(picker.baseCls + aboveSfx);
if (!me.ariaStaticRoles[me.ariaRole]) {
me.ariaEl.dom.setAttribute('aria-expanded', false);
}
// remove event listeners
me.touchListeners.destroy();
me.scrollListeners.destroy();
Ext.un('resize', me.alignPicker, me);
me.fireEvent('collapse', me);
me.onCollapse();
}
},
A simple hack could be to comment the function body of the onFocusLeave method out like here: https://fiddle.sencha.com/#fiddle/3ajo&view/editor
onFocusLeave: function(e) {
// this.collapse();
//this.callParent([e]);
},
You can furthermore place some conditions there if this causes some side effects.
Another option could be to just use a normal field with a custom trigger which shows onclick this window you have defined here.
In response to your comment under this answer.
A picker field is not an editor field.
When you take a look in the Source of the CellEditor you will find this method again:
onFocusLeave: function(e) {
var me = this,
view = me.context.view,
related = Ext.fly(e.relatedTarget);
// Quit editing in whichever way.
// The default is completeEdit.
// If we received an ESC, this will be cancelEdit.
if (me[me.focusLeaveAction]() === false) {
e.event.stopEvent();
return;
}
delete me.focusLeaveAction;
// If the related target is not a cell, turn actionable mode off
if (!view.destroyed && view.el.contains(related) &&
(!related.isAncestor(e.target) || related === view.el) &&
!related.up(view.getCellSelector(), view.el, true)) {
me.context.grid.setActionableMode(false, view.actionPosition);
}
me.cacheElement();
// Bypass Editor's onFocusLeave
Ext.container.Container.prototype.onFocusLeave.apply(me, arguments);
},
In that case you can define the editor field like that:
columns: [{
xtype: 'gridcolumn',
dataIndex: 'name',
text: 'Name',
flex: 1,
editor: {
field: {xtype: 'edithtmlfield'},
focusLeaveAction: false
}
}],
plugins: [{
ptype: 'cellediting'
}]
This will override the default config from 'completeEdit'.
https://docs.sencha.com/extjs/6.5.3/classic/src/CellEditor.js.html
Here is an updated fiddle: https://fiddle.sencha.com/#view/editor&fiddle/3aoa