So that the added zero-width space doesn't confuse readinput, even
if some other event handler messed with the selection in the meantime.

Issue #2566

Issue #2503

Issue #2503

Issue #2556

Issue #2557

Issue #2551

Issue #2554

Add shape-image-threshold and shape-margin.

Issue #2542

Issue #2537

Closes #2533

Fix the condition when XML styling should be invoked.
Also add test cases.

Closes #2539

Doesn't show states (but shouldn't crash) on old browsers.

Issue #2528