Support nested horizontal scrollviews?

[X-Wei]

From the doc it's stated that "the Selectable widget must be a descendant of the scrollable widget" in order to work. So I shall wrap Selectable around MarkdownBody but under a SingleChildScrollView for selectable to work (i.e. SingleChildScrollView -> Selectable -> MarkdownBody), example code.

However, if there are code blocks inside the markdown source, they are rendered as a horizontal scrollview, and selectable will not work well for that area. E.g. if I horizontally scroll then try to select, it selects the text that were in that position before the scroll happens.

Is there any workaround to make it work better for the nested srcollables?

[ronjb]

This is currently a known limitation. Selectable operates in the outer scrollable's coordinate space, so an independently-scrolling nested horizontal region (e.g. a Markdown code block) reports stale positions after you scroll it — which is why the selection lands on the text that was at that position before the scroll. Supporting this properly would require tracking each nested scrollable's offset, so I'm marking it as an enhancement rather than a quick fix. If it's an option for your use case, Flutter's native SelectionArea/SelectableRegion may handle nested scrollables better today.