Center tab labels and unify dock cursor resolution

new_editor/src/Collections/UIEditorTabStrip.cpp

@@ -73,6 +73,21 @@ float ResolveTabTextTop(
     return rect.y + (std::max)(0.0f, (rect.height - kHeaderFontSize) * 0.5f) + metrics.labelInsetY;
 }
 
+float ResolveTabTextLeft(
+    const UIRect& rect,
+    const UIEditorTabStripItem& item,
+    const UIEditorTabStripMetrics& metrics) {
+    const float padding =
+        (std::max)(
+            ClampNonNegative(metrics.layoutMetrics.tabHorizontalPadding),
+            ClampNonNegative(metrics.labelInsetX));
+    const float availableLeft = rect.x + padding;
+    const float availableRight = rect.x + rect.width - padding;
+    const float availableWidth = (std::max)(availableRight - availableLeft, 0.0f);
+    const float labelWidth = ResolveEstimatedLabelWidth(item, metrics);
+    return availableLeft + (std::max)(0.0f, (availableWidth - labelWidth) * 0.5f);
+}
+
 UIColor ResolveStripBorderColor(
     const UIEditorTabStripState& state,
     const UIEditorTabStripPalette& palette) {
@@ -387,8 +402,7 @@ void AppendUIEditorTabStripForeground(
     const UIEditorTabStripPalette& palette,
     const UIEditorTabStripMetrics& metrics) {
     AppendHeaderContentSeparator(drawList, layout, palette, metrics);
-
-    const float leftInset = (std::max)(
+    const float horizontalPadding = (std::max)(
         ClampNonNegative(metrics.layoutMetrics.tabHorizontalPadding),
         ClampNonNegative(metrics.labelInsetX));
 
@@ -396,14 +410,15 @@ void AppendUIEditorTabStripForeground(
         const UIRect& tabRect = layout.tabHeaderRects[index];
         const bool selected = layout.selectedIndex == index;
         const bool hovered = state.hoveredIndex == index;
-        const float textLeft = tabRect.x + leftInset;
-        const float textRight = tabRect.x + tabRect.width - ClampNonNegative(metrics.layoutMetrics.tabHorizontalPadding);
+        const float clipLeft = tabRect.x + horizontalPadding;
+        const float textLeft = ResolveTabTextLeft(tabRect, items[index], metrics);
+        const float textRight = tabRect.x + tabRect.width - horizontalPadding;
 
-        if (textRight > textLeft) {
+        if (textRight > clipLeft) {
             const UIRect clipRect(
-                textLeft,
+                clipLeft,
                 tabRect.y,
-                textRight - textLeft,
+                textRight - clipLeft,
                 tabRect.height);
             drawList.PushClipRect(clipRect, true);
             drawList.AddText(