Currently submitting an edit after an intervening new section (§ion=new) in many cases results in edit conflict. Even for a section edit where two chunks have zero overlap. IMHO when the current edit form is section=something, then it is safe enough to proceed with the edit without conflicting with the new section. The only necessary precaution results from the possibility that the thing added with section=new does not necessarily begin from a valid =…= heading.
If anybody is interested, Ī̲ can formulate a more stringent criterion for saving the section=something edit, which avoids some of remaining loopholes for unintended effects.