Undo: update notes field if changed by undo commands

To keep the UI in a consistent state, update the notes field if
it is changed by an undo command. To that purpose, add a new
signal to diveListNotifier with a list of dives and a field-id
as payload.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

core/subsurface-qt/DiveListNotifier.h

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 
-// The DiveListNotifier emits signals when the dive-list changes (dives/trips created/deleted/moved)
+// The DiveListNotifier emits signals when the dive-list changes (dives/trips created/deleted/moved/edited)
 // Note that vectors are passed by reference, so this will only work for signals inside the UI thread!
 
 #ifndef DIVELISTNOTIFIER_H
@@ -10,6 +10,23 @@
 
 #include <QObject>
 
+// Dive fields that can be edited.
+// Use "enum class" to not polute the global name space.
+enum class DiveField {
+	DATETIME,
+	AIR_TEMP,
+	WATER_TEMP,
+	LOCATION,
+	DIVEMASTER,
+	BUDDY,
+	RATING,
+	VISIBILITY,
+	SUIT,
+	TAGS,
+	MODE,
+	NOTES,
+};
+
 class DiveListNotifier : public QObject {
 	Q_OBJECT
 signals:
@@ -49,6 +66,9 @@ signals:
 	void diveSiteDeleted(dive_site *ds, int idx);
 	void diveSiteDiveCountChanged(dive_site *ds);
 	void diveSiteChanged(dive_site *ds, int field); // field according to LocationInformationModel
+
+	// Signals emitted when dives are edited.
+	void divesEdited(const QVector<dive *> &dives, DiveField);
 public:
 	// Desktop uses the QTreeView class to present the list of dives. The layout
 	// of this class gives us a very fundamental problem, as we can not easily
@@ -60,7 +80,7 @@ public:
 	bool inCommand() const;
 
 	// The following class and function are used by divelist-modifying commands
-	// to signalize that are in-flight. If the returned object goes out of scope,
+	// to signal that they are in-flight. If the returned object goes out of scope,
 	// the command-in-flight status is reset to its previous value. Thus, the
 	// function can be called recursively.
 	class InCommandMarker {