Text files in Mousepad

For an edit the user does not need to watch, edit the file directly (Read/Edit tools, sed); it is faster and exactly verifiable. Open Mousepad when the user wants the file on screen or wants to keep editing themselves.

• Open: desktop_launch with mousepad /path/file.txt (a new tab if Mousepad is already running).
• Mousepad (GTK3) has a full accessibility tree: the document is a text element with the file's contents as its value. desktop_read returns the text; desktop_element_set_text replaces the whole document; to insert, desktop_element_click the document, move with desktop_key (ctrl+End, ctrl+Home) and desktop_type.
• Save: desktop_key ctrl+s with the window set. A new file opens the Save As dialog: its name entry and Save button are elements.
• The window title shows * while there are unsaved changes; check it before closing.

Tier: reversible (files under the snapshot root are covered by undo). Confirm before overwriting a file the user did not name.

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