DroppedNestFiles.Select keeps the dropped paths with the .nest extension
in any case, as the WinForms main window does, ignoring everything else.
It returns full paths in the order dropped, each once however its path is
written, compared as NestTabs compares open files. Any says whether the
drop holds a nest file, so a window accepts it only then.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
NestTabs.SaveAs writes the tab's nest, makes the file its file and name,
and clears its unsaved mark; a write that fails throws and changes
nothing. ExportCopy writes the nest without touching its file, name or
unsaved mark.
Both refuse, before writing anything, a file another open tab shows (so
one file never has two tabs) and a tab that has been closed; Export
also refuses the tab's own file, which only Save may write. Refusals
are a SaveTargetRefusedException whose message says what to do.
SavePath is the file Save writes without asking: only one saved to this
session, as in the WinForms app, so a nest that was only opened asks
for a file on its first Save.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
NestTabs holds the nests open in the desktop app and which one is shown.
Opening a file that is already open switches to its tab instead of
loading it again, and a file that fails to load adds no tab. Closing the
shown tab shows the one to its right, else the one to its left. Each tab
records whether it has unsaved changes, so the host can ask before
closing it or exiting.
ajandClaude Opus 5.5