Dropping support for Internet Explorer 9 and lower (as of 1.5.0)?

Subject: Dropping support for Internet Explorer 9 and lower (as of 1.5.0)?

From: Erik Huelsmann <..hidden..>

Date: Tue, 24 May 2016 22:29:59 +0200

Hi all,

As part of my efforts to resolve the last known regressions in the UI rewrite for 1.5, I'm trying to resolve the part where file-uploads stopped working.

As it turns out, supporting file uploads is a trivial change, *if* we require XHR2/FormData support. In effect (http://caniuse.com/#search=formdata), that would mean dropping support for IE9 and before. [We've required IE8+ for over 9 years (at least since 1.2.0) now.]

On IRC, we (John, David, Yves and I) were unanimous in dropping the support; even Microsoft seems to have dropped support for IE older than IE11 (full details:
https://support.microsoft.com/en-us/lifecycle#gp/Microsoft-Internet-Explorer).

John also notes that PCI standards in the states require TLS 1.1+ as of last month and that IE9 might not even support that.

Workaround for users of older Windows versions is to use FireFox or Chrome.

All in all: it looks acceptable for a release series which needs to be maintained for another 4+ years.

Any objections? If not, I'll document this limitation in our README and make merge the change to make file uploads work (https://github.com/ledgersmb/LedgerSMB/pull/1599/files).

Regards,

Erik.

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