Add test for searching unoptimized icons

Author: SmartFinn

Makefile

@@ -53,7 +53,7 @@ test: test_short
 test-all: test_short test_long
 
 .PHONY: test_short
-test_short: test_renderer test_svg_elems test_symlinks test_filenames
+test_short: test_renderer test_optimization test_svg_elems test_symlinks test_filenames
 
 .PHONY: test_long
 test_long: test_xml_struct
@@ -66,6 +66,13 @@ test_renderer:
 		-e 'd="[a-zA-Z0-9 -.]+\s\.[a-zA-Z0-9 -.]+"' \
 		$(ICON_THEMES)
 
+.PHONY: test_optimization
+test_optimization:
+	# >>> Searching for unoptimized icons
+	@! LC_ALL=C grep -E -rl --include='*.svg' \
+		-e '^<\?xml' \
+		$(ICON_THEMES)
+
 .PHONY: test_svg_elems
 test_svg_elems:
 	# >>> Searching for icons with embedded objects