[pgAdmin][RM5038] Select2 enhancement - Load items on demand (scroll)

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Hi Hackers,

Attached is the patch to enhance select2 used in pgAdmin. The select2
dropdown will show only a few items when opened initially. On scrolling it
will show others. Searching will work as before. This will reduce the
number of DOM nodes on page.
Note that, individual controls can disable the behaviour if desired by
passing onDemandLoad:false for select2 options. It is enabled by default.

Kindly review.

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Thanks and Regards,
Aditya Toshniwal
pgAdmin Hacker | Sr. Software Engineer | EnterpriseDB India | Pune
"Don't Complain about Heat, Plant a TREE"

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:verdana,=
sans-serif">Hi Hackers,</div><div class=3D"gmail_default" style=3D"font-fam=
ily:verdana,sans-serif"><br></div><div class=3D"gmail_default" style=3D"fon=
t-family:verdana,sans-serif">Attached is the patch to enhance=C2=A0select2 =
used in pgAdmin. The select2 dropdown will show only a few items when opene=
d initially. On scrolling it will show others. Searching will work as befor=
e. This will reduce the number of DOM nodes on page.</div><div class=3D"gma=
il_default" style=3D"font-family:verdana,sans-serif">Note that, individual =
controls can disable the behaviour if desired by passing onDemandLoad:false=
 for select2 options. It is enabled by default.</div><div class=3D"gmail_de=
fault" style=3D"font-family:verdana,sans-serif"><br></div><div class=3D"gma=
il_default" style=3D"font-family:verdana,sans-serif">Kindly review.</div><d=
iv><br></div>-- <br><div dir=3D"ltr" class=3D"gmail_signature" data-smartma=
il=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=
=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><font size=3D"2" color=
=3D"#000000" face=3D"verdana, sans-serif">Thanks and Regards,</font><div><s=
pan style=3D"background-color:rgb(255,255,255)"><font size=3D"2" color=3D"#=
000000" face=3D"verdana, sans-serif">Aditya Toshniwal</font></span></div><d=
iv><font face=3D"verdana, sans-serif"><span style=3D"background-color:rgb(2=
55,255,255)"><font size=3D"2" color=3D"#000000">pgAdmin Hacker | Sr. Softwa=
re Engineer |=C2=A0EnterpriseDB India |=C2=A0</font></span><span style=3D"c=
olor:rgb(0,0,0)">Pune</span></font></div><div><font color=3D"#38761d" face=
=3D"verdana, sans-serif" size=3D"1">&quot;Don&#39;t Complain about Heat, Pl=
ant a TREE&quot;</font></div></div></div></div></div></div></div></div></di=
v></div></div></div>

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