tests: Add edittext_gutter test

This test verifies how the gutter of a text field behaves.

tests/tests/swfs/visual/edittext/edittext_gutter/Test.as

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+package {
+import flash.display.Sprite;
+import flash.text.TextField;
+import flash.text.TextFormat;
+
+[SWF(width="100", height="110")]
+public class Test extends Sprite {
+    [Embed(source="TestFont.ttf", fontName="TestFont", embedAsCFF="false", unicodeRange="U+0061-U+0062")]
+    private var testFont:Class;
+
+    private var nextX:int = 2;
+    private var nextY:int = 2;
+
+    public function Test() {
+        stage.scaleMode = "noScale";
+
+        newTextField("a", 0, 0);
+        newTextField("a", 1, 0);
+        newTextField("a", 2, 0);
+        newTextField("a", 3, 0);
+        newTextField("a", 4, 0);
+        newTextField("a", 5, 0);
+        newTextField("a", 6, 0);
+        newTextField("a", 7, 0);
+        newTextField("a", 8, 0);
+        newTextField("a", 40, 0);
+        nextY += 34;
+        nextX = 2;
+
+        newTextField("b", 0, 0);
+        newTextField("b", 1, 0);
+        newTextField("b", 2, 0);
+        newTextField("b", 3, 0);
+        newTextField("b", 4, 0);
+        newTextField("b", 5, 0);
+        newTextField("b", 6, 0);
+        newTextField("b", 7, 0);
+        newTextField("b", 8, 0);
+        newTextField("b", 40, 0);
+        nextY += 34;
+        nextX = 2;
+
+        newTextField("b", 6, 0);
+        newTextField("b", 6, 1);
+        newTextField("b", 6, 2);
+        newTextField("b", 6, 3);
+        newTextField("b", 6, 4);
+        newTextField("b", 6, 5);
+        newTextField("b", 6, 6);
+        newTextField("b", 6, 18);
+        newTextField("b", 6, 19);
+        newTextField("b", 6, 20);
+        newTextField("b", 6, 21);
+        newTextField("b", 6, 22);
+    }
+
+    private function newTextField(value: String, width: int, hscroll: int): void {
+        var text:TextField = new TextField();
+        text.border = true;
+        text.width = width;
+        text.x = nextX;
+        text.y = nextY;
+        text.height = 30;
+        text.embedFonts = true;
+        var tf = new TextFormat();
+        tf.font = "TestFont";
+        tf.size = 20;
+        text.defaultTextFormat = tf;
+        text.text = value;
+        text.scrollH = hscroll;
+        nextX += text.width + 2;
+        addChild(text);
+    }
+
+}
+}

tests/tests/swfs/visual/edittext/edittext_gutter/TestFont.sfd

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+SplineFontDB: 3.2
+FontName: TestFont
+FullName: TestFont
+FamilyName: TestFont
+Weight: Regular
+Copyright: Copyright (c) 2024, Kamil Jarosz
+UComments: "2024-7-24: Created with FontForge (http://fontforge.org)"
+Version: 001.000
+ItalicAngle: 0
+UnderlinePosition: -100
+UnderlineWidth: 50
+Ascent: 800
+Descent: 200
+InvalidEm: 0
+LayerCount: 2
+Layer: 0 0 "Back" 1
+Layer: 1 0 "Fore" 0
+XUID: [1021 253 198287149 6396829]
+StyleMap: 0x0000
+FSType: 0
+OS2Version: 0
+OS2_WeightWidthSlopeOnly: 0
+OS2_UseTypoMetrics: 1
+CreationTime: 1721856925
+ModificationTime: 1728902792
+OS2TypoAscent: 0
+OS2TypoAOffset: 1
+OS2TypoDescent: 0
+OS2TypoDOffset: 1
+OS2TypoLinegap: 90
+OS2WinAscent: 0
+OS2WinAOffset: 1
+OS2WinDescent: 0
+OS2WinDOffset: 1
+HheadAscent: 0
+HheadAOffset: 1
+HheadDescent: 0
+HheadDOffset: 1
+OS2Vendor: 'PfEd'
+MarkAttachClasses: 1
+DEI: 91125
+Encoding: ISO8859-1
+UnicodeInterp: none
+NameList: AGL For New Fonts
+DisplaySize: -48
+AntiAlias: 1
+FitToEm: 0
+WinInfo: 0 30 10
+BeginPrivate: 0
+EndPrivate
+BeginChars: 256 2
+
+StartChar: a
+Encoding: 97 97 0
+Width: 50
+Flags: HW
+LayerCount: 2
+Fore
+SplineSet
+0 800 m 1
+ 50 800 l 1
+ 50 0 l 1
+ 0 0 l 1
+ 0 800 l 1
+EndSplineSet
+EndChar
+
+StartChar: b
+Encoding: 98 98 1
+Width: 1000
+Flags: HW
+LayerCount: 2
+Fore
+SplineSet
+0 800 m 1
+ 1000 800 l 1
+ 1000 0 l 1
+ 0 0 l 1
+ 0 800 l 1
+EndSplineSet
+EndChar
+EndChars
+EndSplineFont

tests/tests/swfs/visual/edittext/edittext_gutter/test.toml

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+num_ticks = 1
+
+[image_comparisons.output]
+tolerance = 128
+
+[player_options]
+with_renderer = { optional = false, sample_count = 4 }