Improve HTML formatter output.improve-linenos-handling

With the previous changes, we started to emit one <pre> per line for
line numbers. This breaks for instance the Sphinx-RTD-Theme, which
expects the line numbers to be formatted the same way as the normal
content. This commit makes the following changes:

* Emit a single <pre> inside the linenos div
* Wrap individual lines into <span> as needed
* Update all tests
* Don't yield empty <span> elements when no style is specified

This also makes the .html test files look correct when looked at with a
browser, as there is no extra whitespace in them which needs stripping.

0 files changed, 0 insertions, 0 deletions