Function request: queue_script/style 'local' parameter

[Tyblitz]

I keep having trouble due to plugins not loading assets only for their page.
This is because the queue_script and queue_style functions by default load the scripts on any page (which is good, because some plugins offer cross-tab/ front-end functionality). Ideally all plugin devs would be conscious of this, but as that isn't the case, I'd like to request either a new parameter

Consequences are that JS scripts will throw errors, and CSS from plugins messes up CSS from other plugins/ pages.
For example, the excellent ItemManager plugin loads a jquery-ui theme, and messes up the lay-out of the GS Custom Settings datepicker (look at the icons in the orange bar): 



The simple solution is to modify the queue_ functions in plugin_functions.php:

PHP Code:

<?php 
function queue_style($handle,$where=1,$localID=NULL){
  global $GS_styles, $id;
  if (array_key_exists($handle, $GS_styles)){
     if (!$localID || (($id === $localID) || (is_array($localID) && array_search($id, $localID) !== FALSE))) { 
        $GS_styles[$handle]['load']=true;
        $GS_styles[$handle]['where']=$GS_styles[$handle]['where'] | $where;
     }
  }
} ?>

With the above solution, one could queue scripts/styles as follows:

PHP Code:

<?php 
  queue_style('jqui', GSBACK);                 // load on all backend pages
  queue_style('jqui', GSBACK, 'imanager');     // only load on backend page with id === 'imanager'
  $pages = array('imanager','custom_settings');// load on all backend pages with id's in the array
  queue_style('jqui', GSBACK, $pages); 
?>

Alternatively, the $where parameter could be modified to hold id string/ array as well; eg:

PHP Code:

function get_styles_backend(){
    global $GS_styles, $id;
    foreach ($GS_styles as $style){
        if (($style['where'] && GSBACK && is_numeric($style['where'])) || (($style['where'] === $id) || (is_array($style['where']) && array_search($id, $style['where']) !== FALSE))) {
                if ($style['load']==TRUE){
                    echo "\t".'<link href="'.$style['src'].'?v='.$style['ver'].'" rel="stylesheet" media="'.$style['media']."\">\n";
                }
        }
    }
} 


Usage as follows:

PHP Code:

<?php 
  queue_style('jqui', GSBACK);                 // load on all backend pages
  queue_style('jqui', 'imanager');     // only load on backend page with id === 'imanager'
  $pages = array('imanager','custom_settings');// load on all backend pages with id's in the array
  queue_style('jqui', $pages); 
?>