[Inspector V2] Align tree connection lines to widget icons (#8842)

diff --git a/packages/devtools_app/lib/src/screens/inspector_v2/inspector_tree_controller.dart b/packages/devtools_app/lib/src/screens/inspector_v2/inspector_tree_controller.dart
index 857e462..5988ef1 100644
--- a/packages/devtools_app/lib/src/screens/inspector_v2/inspector_tree_controller.dart
+++ b/packages/devtools_app/lib/src/screens/inspector_v2/inspector_tree_controller.dart

@@ -1237,14 +1237,10 @@
       ..color = colorScheme.treeGuidelineColor
       ..strokeWidth = chartLineStrokeWidth;
 
-/// The distance (on the x-axis) between the expand/collapse and the start of
-/// the row, as determined by a percentage of the [inspectorColumnIndent].
-const _expandCollapseToRowStartXDistancePercentage = 0.68;
-
 /// The distance (on the x-axis) between the center of the widget icon and the
 /// start of the row, as determined by a percentage of the
 /// [inspectorColumnIndent].
-const _iconCenterToRowStartXDistancePercentage = 0.15;
+const _iconCenterToRowStartXDistancePercentage = 0.41;
 
 /// The distance (on the y-axis) between the bottom of the widget icon and the
 /// top of the row, as determined by a percentage of the [inspectorRowHeight].
@@ -1277,12 +1273,11 @@
 
     final node = row.node;
     final showExpandCollapse = node.showExpandCollapse;
-    final distanceFromExpandCollapseToRowStart =
-        inspectorColumnIndent * _expandCollapseToRowStartXDistancePercentage;
+    final distanceFromIconCenterToRowStart =
+        inspectorColumnIndent * _iconCenterToRowStartXDistancePercentage;
     for (final tick in row.ticks) {
       final expandCollapseX =
-          _controller.getDepthIndent(tick) -
-          distanceFromExpandCollapseToRowStart;
+          _controller.getDepthIndent(tick) - distanceFromIconCenterToRowStart;
       // Draw a vertical line for each tick identifying a connection between
       // an ancestor of this node and some other node in the tree.
       canvas.drawLine(
@@ -1296,11 +1291,11 @@
     if (row.lineToParent) {
       final parentExpandCollapseX =
           _controller.getDepthIndent(row.depth - 1) -
-          distanceFromExpandCollapseToRowStart;
+          distanceFromIconCenterToRowStart;
       final width =
           showExpandCollapse
-              ? inspectorColumnIndent * 0.6
-              : inspectorColumnIndent;
+              ? inspectorColumnIndent * 0.45
+              : inspectorColumnIndent * .6;
       canvas.drawLine(
         Offset(parentExpandCollapseX, 0.0),
         Offset(parentExpandCollapseX, inspectorRowHeight * 0.5),

diff --git a/packages/devtools_app/lib/src/shared/console/eval/inspector_tree_v2.dart b/packages/devtools_app/lib/src/shared/console/eval/inspector_tree_v2.dart
index 3bcca5c..ffe2502 100644
--- a/packages/devtools_app/lib/src/shared/console/eval/inspector_tree_v2.dart
+++ b/packages/devtools_app/lib/src/shared/console/eval/inspector_tree_v2.dart

@@ -27,7 +27,7 @@
 
 const iconPadding = 4.0;
 const chartLineStrokeWidth = 1.0;
-double get inspectorColumnIndent => scaleByFontFactor(24.0);
+double get inspectorColumnIndent => scaleByFontFactor(36.0);
 double get inspectorRowHeight => scaleByFontFactor(20.0);
 
 /// This class could be refactored out to be a reasonable generic collapsible

diff --git a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_errors_1_initial_load.png b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_errors_1_initial_load.png
index dba5bb0..8a85abb 100644
--- a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_errors_1_initial_load.png
+++ b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_errors_1_initial_load.png
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diff --git a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_errors_2_error_selected.png b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_errors_2_error_selected.png
index 1e4f85d..5b29b3f 100644
--- a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_errors_2_error_selected.png
+++ b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_errors_2_error_selected.png
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diff --git a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_hideable_widget_selected.png b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_hideable_widget_selected.png
index 1db7248..1be1c6d 100644
--- a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_hideable_widget_selected.png
+++ b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_hideable_widget_selected.png
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diff --git a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_hideable_widget_selected_from_search.png b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_hideable_widget_selected_from_search.png
index 1db7248..1be1c6d 100644
--- a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_hideable_widget_selected_from_search.png
+++ b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_hideable_widget_selected_from_search.png
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diff --git a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_collapsed.png b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_collapsed.png
index 25fefb1..df776da 100644
--- a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_collapsed.png
+++ b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_collapsed.png
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diff --git a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_expanded.png b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_expanded.png
index 5fc3b1c..97d7267 100644
--- a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_expanded.png
+++ b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_expanded.png
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diff --git a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_hidden.png b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_hidden.png
index 88eb5b3..0d32fd4 100644
--- a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_hidden.png
+++ b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_implementation_widgets_hidden.png
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diff --git a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_initial_load.png b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_initial_load.png
index 328f8ed..84081cf 100644
--- a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_initial_load.png
+++ b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_initial_load.png
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diff --git a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_select_center.png b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_select_center.png
index cc9aa44..b183464 100644
--- a/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_select_center.png
+++ b/packages/devtools_app/test/test_infra/goldens/integration_inspector_v2_select_center.png
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