collapseAllFolds method
Collapses every fold range.
Implementation
bool collapseAllFolds() {
if (folds.ranges.isEmpty) return false;
final collapsedBefore = folds.collapsedStarts.length;
folds.collapseAll();
if (folds.collapsedStarts.length == collapsedBefore) return false;
if (!_moveHiddenCursorsToFoldHeaders()) _syncCoreState();
return true;
}