Fix scrolling and keep lists clear of the scrollbar

Scroll kept its position as an int, so wheel and trackpad deltas were
truncated: small ones were lost in one direction and a wheel notch moved
one unit. It now keeps a fractional position, scrolls 24 units a notch,
sizes and places its thumb consistently, and the thumb can be dragged or
the track clicked. PanelScreen's scrollWidth and scrollContentWidth keep
every scrolling list clear of the bar.

Sliders read a float step from its text, so 0.1 no longer shows 17
decimals, and show at most three; number boxes show at most three too.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/main/java/org/saturnclient/ui/components/inputs/FloatInput.java

@@ -1,5 +1,8 @@
 package org.saturnclient.ui.components.inputs;
 
+import java.math.BigDecimal;
+import java.math.RoundingMode;
+
 import org.saturnclient.config.ConfigManager;
 import org.saturnclient.config.property.FloatProperty;
 import org.saturnclient.ui.elements.Field;
@@ -11,7 +14,16 @@ public class FloatInput extends Input {
         this.width = 96;
         this.height = Field.HEIGHT;
         this.prop = prop;
-        this.text = String.valueOf(prop.value);
+        this.text = format(prop.value);
+    }
+
+    /**
+     * The value with at most three decimals and no trailing zeros, since floats
+     * like 1.2000000476837158 can't be stored exactly.
+     */
+    private static String format(float value) {
+        return new BigDecimal(Float.toString(value)).setScale(3, RoundingMode.HALF_UP).stripTrailingZeros()
+                .toPlainString();
     }
 
     @Override
@@ -51,7 +63,7 @@ public class FloatInput extends Input {
     @Override
     public void checkReset() {
         if (prop.isReset) {
-            this.text = String.valueOf(prop.value);
+            this.text = format(prop.value);
             this.cursorPosition = 0;
             prop.isReset = false;
         }

src/main/java/org/saturnclient/ui/components/inputs/Slider.java

@@ -23,6 +23,7 @@ public class Slider extends Element {
     private static final int KNOB = 16;
     private static final int VALUE_WIDTH = 72;
     private static final int VALUE_GAP = 14;
+    private static final int MAX_DECIMALS = 3;
 
     private final double min, max, step;
     private final int decimals;
@@ -32,25 +33,28 @@ public class Slider extends Element {
 
     private boolean dragging = false;
 
-    private Slider(double min, double max, double step, String unit, DoubleSupplier value, DoubleConsumer onChange) {
+    /**
+     * @param step as text, so a float step like 0.1 isn't read as 0.10000000149
+     */
+    private Slider(double min, double max, String step, String unit, DoubleSupplier value, DoubleConsumer onChange) {
         this.min = min;
         this.max = max;
-        this.step = step;
+        this.step = Double.parseDouble(step);
         this.unit = unit;
         this.value = value;
         this.onChange = onChange;
-        this.decimals = Math.max(0, BigDecimal.valueOf(step).stripTrailingZeros().scale());
+        this.decimals = Math.min(MAX_DECIMALS, Math.max(0, new BigDecimal(step).stripTrailingZeros().scale()));
         this.width = 280;
         this.height = Field.HEIGHT;
     }
 
     public static Slider of(IntProperty prop) {
-        return new Slider(prop.min, prop.max, prop.step, prop.unit, () -> prop.value,
+        return new Slider(prop.min, prop.max, Integer.toString(prop.step), prop.unit, () -> prop.value,
                 v -> prop.value = (int) Math.round(v));
     }
 
     public static Slider of(FloatProperty prop) {
-        return new Slider(prop.min, prop.max, prop.step, prop.unit, () -> prop.value,
+        return new Slider(prop.min, prop.max, Float.toString(prop.step), prop.unit, () -> prop.value,
                 v -> prop.value = (float) v);
     }