Elements intended only for screen readers degrade some interactions

[gibson042]

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Bug

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The h2 elements with class "sr-only", attribute data-testid="screen-reader-heading", and [English] text content "Breadcrumbs" are intended only for screen readers, but negatively affect page interactions. For example:

1. Launch Google Chrome or Chromium (this specific scenario behaves differently in e.g. Firefox).
2. Visit a repository code file page, e.g. https://github.com/community/community/blob/main/.github/DISCUSSION_TEMPLATE/accessibility.yml
3. At the top of the main pane (i.e., the one associated with the div having attribute data-selector="repos-split-pane-content"), observe the path breadcrumbs (in this case, "community/.github/DISCUSSION_TEMPLATE/accessibility.yml"), followed by a "Copy path" button.
4. Select the full text of those breadcrumbs from the end, e.g. by starting selection at the end of the file extension (in this case, "yml") and expanding it to include the entirety of the repository name (in this case, "community").
   
   I usually do this by mouse, double-clicking on the extension and dragging the cursor over the repository name before lifting up to end the double-click.
5. Copy the selection.
6. Paste it somewhere, observing that the repository name has been prefixed—in this case, the selection is

   Breadcrumbscommunity/.github/DISCUSSION_TEMPLATE
   /accessibility.yml
   

This issue seems to occur because there is nothing separating the h2 from its following ol, and one way to fix it would be insertion of a zero-width space ​ between them (although unfortunately not a <wbr>). It would also be less relevant to me if the "Copy path" button were carried into the sticky file header that appears when scrolling down, rather than being limited to the static header visible only at the top of pane/page.

Other instances of class "sr-only" have similar effects, such as how copying the "$organizationName/$repositoryName" in the repository page context header excludes the sr-only slash, resulting in e.g. a selection of "communitycommunity".

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