undo: add undo command for dive-mode switch

This basically copies the bookmark code, with the addition that
the dive mode is recorded in the text of the undo command.

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

commands/command.cpp

@@ -334,4 +334,9 @@ void addEventBookmark(struct dive *d, int dcNr, int seconds)
 	execute(new AddEventBookmark(d, dcNr, seconds));
 }
 
+void addEventDivemodeSwitch(struct dive *d, int dcNr, int seconds, int divemode)
+{
+	execute(new AddEventDivemodeSwitch(d, dcNr, seconds, divemode));
+}
+
 } // namespace Command

commands/command.h

@@ -107,6 +107,7 @@ void editTripNotes(dive_trip *trip, const QString &s);
 // 6) Event commands
 
 void addEventBookmark(struct dive *d, int dcNr, int seconds);
+void addEventDivemodeSwitch(struct dive *d, int dcNr, int seconds, int divemode);
 
 } // namespace Command
 

commands/command_event.cpp

@@ -4,6 +4,7 @@
 #include "core/dive.h"
 #include "core/subsurface-qt/divelistnotifier.h"
 #include "core/libdivecomputer.h"
+#include "core/gettextfromc.h"
 
 namespace Command {
 
@@ -42,4 +43,10 @@ AddEventBookmark::AddEventBookmark(struct dive *d, int dcNr, int seconds) :
 	setText(tr("Add bookmark"));
 }
 
+AddEventDivemodeSwitch::AddEventDivemodeSwitch(struct dive *d, int dcNr, int seconds, int divemode) :
+	AddEventBase(d, dcNr, create_event(seconds, SAMPLE_EVENT_BOOKMARK, 0, divemode, QT_TRANSLATE_NOOP("gettextFromC", "modechange")))
+{
+	setText(tr("Add dive mode switch to %1").arg(gettextFromC::tr(divemode_text_ui[divemode])));
+}
+
 } // namespace Command

commands/command_event.h

@@ -39,6 +39,11 @@ public:
 	AddEventBookmark(struct dive *d, int dcNr, int seconds);
 };
 
+class AddEventDivemodeSwitch : public AddEventBase {
+public:
+	AddEventDivemodeSwitch(struct dive *d, int dcNr, int seconds, int divemode);
+};
+
 } // namespace Command
 
 #endif // COMMAND_EVENT_H

profile-widget/profilewidget2.cpp

@@ -1606,10 +1606,7 @@ void ProfileWidget2::addBookmark(int seconds)
 
 void ProfileWidget2::addDivemodeSwitch(int seconds, int divemode)
 {
-	add_event(current_dc, seconds, SAMPLE_EVENT_BOOKMARK, 0, divemode, QT_TRANSLATE_NOOP("gettextFromC", "modechange"));
+	Command::addEventDivemodeSwitch(current_dive, dc_number, seconds, divemode);
-	invalidate_dive_cache(current_dive);
-	mark_divelist_changed(true);
-	replot();
 }
 
 void ProfileWidget2::addSetpointChange(int seconds)