com_installer. Remove button update.purge

[ghost]

Summary of Changes

In view
administrator/index.php?option=com_installer&view=update
we don't need the button Clear Cache (purge()) because button Find Updates always calls the purge() method, too.
This PR removes button Clear Cache.

Testing Instructions

Hm, that's a problem. I don't know how to provide instructions before/after because both buttons work correctly but button Find Updates is sufficient because it includes a Clear Cache.

Button Find Updates calls
controllers/update.php::find()

that's calling
$model->findUpdates(...)
https://github.com/joomla/joomla-cms/blob/staging/administrator/components/com_installer/controllers/update.php#L106

that's always calling the purge()-method.
https://github.com/joomla/joomla-cms/blob/staging/administrator/components/com_installer/models/update.php#L255-L258

[brianteeman]

I cant find it now but I seem to recall a big debate in the past over this

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/10644.}

[zero-24]

@brianteeman @bertmert #3775 and 389374f

[brianteeman]

yes thats the one

[ghost]

The arguments there are outdated or wrong concerning cache times and so on or I don't understand the higher philosophy behind that discussion CONCERNING THESE BUTTONS (please tell me).

Joomla 3.5.1 and current staging: Fact is: When you click on Find Updates a complete purge is always done in the same way as when you just click on Clear Cache.

Why should I click just Clear Cache? To see an empty list? Then click on Find Updates to do a second purge that's done already?