Switch iconset to SVG-only — drop small/medium/large PNG directories

All iconset icons (ipackage=icons) now served from scalable/ as SVGs.
ipath (/small/, /medium/, /large/) is preserved only for cache key
differentiation and SVG width/height calculation; no PNG directory
lookups are performed.

Four icons remapped to SVG equivalents that exist in tango/scalable/:
  dialog-cancel     -> process-stop     (newsletters: unsubscribed)
  emblem-downloads  -> network-receive  (fisheye: download file)
  emblem-shared     -> emblem-symbolic-link (boards: moved topic)
  mail-mark-important -> emblem-important   (messages: flagged)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2 files changed, 7 insertions, 27 deletions

diff --git a/icon_browser.php b/icon_browser.php
index 52cbadc..f542bc7 100755
--- a/icon_browser.php
+++ b/icon_browser.php
@@ -55,8 +55,7 @@ $iconUsage = [
 	"dialog-warning"                 => "Warning",
 	"dialog-error"                   => "Error",
 	"dialog-information"             => "Information / announcement",
-	"dialog-cancel"                  => "Cancel",
-	"process-stop"                   => "Stop / cancel / disable",
+	"process-stop"                   => "Stop / cancel / disable / unsubscribed",
 	"emblem-important"               => "Required / flagged / asterisk",
 	// Communication
 	"internet-mail"                  => "Email / envelope / inbox",
@@ -76,9 +75,8 @@ $iconUsage = [
 	"preferences-system-network-proxy" => "Telephone / contact",
 	// Emblems
 	"emblem-favorite"                => "Bookmark / tag / favourite",
-	"emblem-shared"                  => "Shared / unlocked",
-	"emblem-symbolic-link"           => "Link",
-	"emblem-downloads"               => "Download emblem",
+	"emblem-shared"                  => "Shared / unlocked (boards: moved topic)",
+	"emblem-symbolic-link"           => "Link / moved thread",
 	"emblem-photos"                  => "Photos emblem",
 	// Media
 	"camera-photo"                   => "Camera / photo",
@@ -150,7 +148,7 @@ function icon_fetcher( $pStyle = DEFAULT_ICON_STYLE ) {
 	if( strpos( $pStyle, '.' ) !== 0 && $pStyle != 'CVS' ) {
 		$stylePath = UTIL_PKG_PATH."iconsets/".$pStyle;
 
-		// Primary: scalable SVGs give the most complete name list
+		// Iconsets are SVG-only: list from scalable/
 		if( is_dir( $stylePath."/scalable" )) {
 			foreach( scandir( $stylePath."/scalable" ) as $icon ) {
 				if( preg_match( "#\.svg$#", $icon )) {
@@ -160,15 +158,6 @@ function icon_fetcher( $pStyle = DEFAULT_ICON_STYLE ) {
 			}
 		}
 
-		// Supplement with large PNGs not covered by scalable
-		if( is_dir( $stylePath."/large" )) {
-			foreach( scandir( $stylePath."/large" ) as $icon ) {
-				if( preg_match( "#\.png$#", $icon ) && !preg_match( "#^process-working\.#", $icon )) {
-					$name = substr( $icon, 0, -4 );
-					$ret[$name] ??= $name;
-				}
-			}
-		}
 	}
 	ksort( $ret );
 	return $ret;
diff --git a/smartyplugins/function.biticon.php b/smartyplugins/function.biticon.php
index e219036..adc4edb 100755
--- a/smartyplugins/function.biticon.php
+++ b/smartyplugins/function.biticon.php
@@ -172,22 +172,13 @@ function smarty_function_biticon( $pParams, $pSmall = false ) {
 		// violators will be poked with soft cushions by the Cardinal himself!!!
 		$icon_style = !empty( $pParams['istyle'] ) ? $pParams['istyle'] : $gBitSystem->getConfig( 'site_icon_style', DEFAULT_ICON_STYLE );
 
-		if( false !== ( $matchFile = biticon_first_match( UTIL_PKG_PATH."iconsets/$icon_style".$pParams['ipath'], $pParams['iname'] ))) {
-			return biticon_output( $pParams, UTIL_PKG_URL."iconsets/$icon_style".$pParams['ipath'].$matchFile );
-		}
-
-		if( $icon_style != DEFAULT_ICON_STYLE && false !== ( $matchFile = biticon_first_match( UTIL_PKG_PATH."iconsets/".DEFAULT_ICON_STYLE.$pParams['ipath'], $pParams['iname'] ))) {
-			return biticon_output( $pParams, UTIL_PKG_URL."iconsets/".DEFAULT_ICON_STYLE.$pParams['ipath'].$matchFile );
-		}
-
-		// SVG fallback: raster not found, try scalable/ directory
-		$isize = trim( $pParams['ipath'], '/' );
+		// Iconsets are SVG-only: serve from scalable/ at ipath-derived dimensions.
+		// ipath (/small/, /medium/, /large/) is preserved for cache key differentiation.
+		$pParams['isize'] = trim( $pParams['ipath'], '/' );
 		if( false !== ( $matchFile = biticon_first_match( UTIL_PKG_PATH."iconsets/$icon_style/scalable/", $pParams['iname'], ['svg'] ))) {
-			$pParams['isize'] = $isize;
 			return biticon_output( $pParams, UTIL_PKG_URL."iconsets/$icon_style/scalable/".$matchFile );
 		}
 		if( $icon_style != DEFAULT_ICON_STYLE && false !== ( $matchFile = biticon_first_match( UTIL_PKG_PATH."iconsets/".DEFAULT_ICON_STYLE."/scalable/", $pParams['iname'], ['svg'] ))) {
-			$pParams['isize'] = $isize;
 			return biticon_output( $pParams, UTIL_PKG_URL."iconsets/".DEFAULT_ICON_STYLE."/scalable/".$matchFile );
 		}