Use ScrollConfiguration scroll physics instead of hardcoded ClampingScrollPhysics

[joyeeve-bot]

Description

CodeEditor hardcodes ClampingScrollPhysics() on its internal Scrollable, which ignores the app's ScrollConfiguration / platform scroll behavior.

Flutter's TextField / EditableText does not hardcode scroll physics. For multiline fields, it uses:

physics: widget.scrollPhysics ?? null,

When scrollPhysics is null, the Scrollable inherits physics from ScrollConfiguration (e.g. CupertinoScrollBehavior → BouncingScrollPhysics on iOS, ClampingScrollPhysics on Android).

In re_editor, _CodeScrollable always uses:

return Scrollable(
  scrollBehavior: _ScrollBehavior(scrollbarBuilder),
  physics: const ClampingScrollPhysics(), // hardcoded
  ...
);

Additionally, _ScrollBehavior.getScrollPhysics() returns a custom _ScrollPhysics instance instead of delegating to super.getScrollPhysics(context).

As a result, when CodeEditor is nested inside an outer ScrollView (common for long-form text fields), scroll behavior at the edges differs from TextField on the same page — especially on iOS.

Expected behavior
CodeEditor should use the same scroll physics as other text inputs in the app (via ScrollConfiguration), matching TextField / EditableText behavior on each platform.

Actual behavior
CodeEditor always uses hardcoded ClampingScrollPhysics, regardless of platform or app-level ScrollConfiguration. Nested scroll behavior differs from TextField.

Relevant code (_code_scroll.dart):


return Scrollable(
  excludeFromSemantics: true,
  controller: controller,
  scrollBehavior: _ScrollBehavior(scrollbarBuilder),
  viewportBuilder: viewportBuilder,
  axisDirection: axisDirection,
  physics: const ClampingScrollPhysics(),
);

Proposed solution
1. Remove the hardcoded physics: const ClampingScrollPhysics() from _CodeScrollable, or
2. Add an optional ScrollPhysics? scrollPhysics parameter to CodeEditor (same API as TextField), defaulting to null so ScrollConfiguration is used.
Also update _ScrollBehavior.getScrollPhysics() to delegate to platform defaults:

@override
ScrollPhysics getScrollPhysics(BuildContext context) {
  return super.getScrollPhysics(context);
}

Keep _ScrollPhysics only for desktop RawScrollbar dragging if needed, separate from the main Scrollable physics.

This is a small, backward-compatible change that aligns CodeEditor with Flutter's standard text input widgets.

[joyeeve-bot]

We tested the proposed physics changes locally on Android but saw no practical improvement for our nested scrolling use case, so I'm closing this issue for now. Thanks!