Editor flavor — insert text at the focused editor's caret in the CURRENT session
(session.getActiveEditor().insertText). This is the editor override a focused editor contributes
for the same keys; caret ops are per-editor (two editors on one cell share the value, not the caret).
Returns false (a no-op) when no edit session is active — the caller falls back to startEditWith.
Editor flavor — insert
textat the focused editor's caret in the CURRENT session (session.getActiveEditor().insertText). This is the editor override a focused editor contributes for the same keys; caret ops are per-editor (two editors on one cell share the value, not the caret). Returnsfalse(a no-op) when no edit session is active — the caller falls back to startEditWith.