profile: remove [disable|enable]Shortcuts() signals

When switching to the "plan" or "add" (which should rather be
called "edit", by the way) mode of the profile, the "shortcuts"
for copy&paste, undo&redo, etc. are disabled. When switching
to "profile" mode, they are reenabled.

This was done in a most convoluted way:

- The MainWindow calls the set*State() function of the profile.
- The Profile emits [disable|enable]Shortcuts() signals.
- The MainWindow catches these signals and does the enabling
  or disabling.

Not only is this very hard to reason about, it is also in
contradiction to the profile being part of the display layer.

Moreover, in editCurrentDive() the MainWindow disabled the
shortcuts itself, so this was all redundant.

For the sake of sanity, let's just move this logic to the
MainWindow, unslotify the [disable|enable]Shortcuts() functions
and make them private.

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

desktop-widgets/mainwindow.cpp

@@ -297,8 +297,6 @@ MainWindow::MainWindow() : QMainWindow(),
 
 	// now let's set up some connections
 	connect(graphics, &ProfileWidget2::enableToolbar ,this, &MainWindow::setEnabledToolbar);
-	connect(graphics, &ProfileWidget2::disableShortcuts, this, &MainWindow::disableShortcuts);
-	connect(graphics, &ProfileWidget2::enableShortcuts, this, &MainWindow::enableShortcuts);
 	connect(graphics, &ProfileWidget2::editCurrentDive, this, &MainWindow::editCurrentDive);
 
 	connect(&diveListNotifier, &DiveListNotifier::settingsChanged, graphics, &ProfileWidget2::settingsChanged);
@@ -771,6 +769,7 @@ void MainWindow::on_actionReplanDive_triggered()
 	// put us in PLAN mode
 	setApplicationState(ApplicationState::PlanDive);
 
+	disableShortcuts(true);
 	graphics->setPlanState(&displayed_dive, 0);
 	plannerWidgets->replanDive();
 }
@@ -783,6 +782,7 @@ void MainWindow::on_actionDivePlanner_triggered()
 	// put us in PLAN mode
 	setApplicationState(ApplicationState::PlanDive);
 
+	disableShortcuts(true);
 	graphics->setPlanState(&displayed_dive, 0);
 	plannerWidgets->planDive();
 }
@@ -1515,7 +1515,7 @@ void MainWindow::editCurrentDive()
 	if (mainTab->isEditing() || DivePlannerPointsModel::instance()->currentMode() != DivePlannerPointsModel::NOTHING)
 		return;
 
-	disableShortcuts();
+	disableShortcuts(false);
 	copy_dive(current_dive, &displayed_dive); // Work on a copy of the dive
 	DivePlannerPointsModel::instance()->setPlanMode(DivePlannerPointsModel::ADD);
 	DivePlannerPointsModel::instance()->loadFromDive(&displayed_dive);

desktop-widgets/mainwindow.h

@@ -164,8 +164,6 @@ public
 	void setEnabledToolbar(bool arg1);
 	// Some shortcuts like "change DC" or "copy/paste dive components"
 	// should only be enabled when the profile's visible.
-	void disableShortcuts(bool disablePaste = true);
-	void enableShortcuts();
 	void startDiveSiteEdit();
 
 private:
@@ -237,6 +235,8 @@ public
 	void setQuadrantWidget(QSplitter &splitter, const Quadrant &q, int pos);
 	void setQuadrantWidgets(QSplitter &splitter, const Quadrant &left, const Quadrant &right);
 	void registerApplicationState(ApplicationState state, Quadrants q);
+	void disableShortcuts(bool disablePaste = true);
+	void enableShortcuts();
 
 	QMenu *connections;
 	QAction *share_on_fb;

profile-widget/profilewidget2.cpp

@@ -1127,8 +1127,6 @@ void ProfileWidget2::setProfileState()
 	disconnectTemporaryConnections();
 	/* show the same stuff that the profile shows. */
 
-	emit enableShortcuts();
-
 	currentState = PROFILE;
 	emit enableToolbar(true);
 	setBackgroundBrush(getColor(::BACKGROUND, isGrayscale));
@@ -1279,7 +1277,6 @@ void ProfileWidget2::setAddState(const dive *d, int dc)
 	mouseFollowerHorizontal->setLine(timeAxis->line());
 	mouseFollowerVertical->setLine(QLineF(0, profileYAxis->pos().y(), 0, timeAxis->pos().y()));
 	disconnectTemporaryConnections();
-	emit disableShortcuts(false);
 	actionsForKeys[Qt::Key_Left]->setShortcut(Qt::Key_Left);
 	actionsForKeys[Qt::Key_Right]->setShortcut(Qt::Key_Right);
 	actionsForKeys[Qt::Key_Up]->setShortcut(Qt::Key_Up);
@@ -1310,7 +1307,6 @@ void ProfileWidget2::setPlanState(const dive *d, int dc)
 	mouseFollowerHorizontal->setLine(timeAxis->line());
 	mouseFollowerVertical->setLine(QLineF(0, profileYAxis->pos().y(), 0, timeAxis->pos().y()));
 	disconnectTemporaryConnections();
-	emit disableShortcuts(true);
 	actionsForKeys[Qt::Key_Left]->setShortcut(Qt::Key_Left);
 	actionsForKeys[Qt::Key_Right]->setShortcut(Qt::Key_Right);
 	actionsForKeys[Qt::Key_Up]->setShortcut(Qt::Key_Up);

profile-widget/profilewidget2.h

@@ -100,8 +100,6 @@ class ProfileWidget2 : public QGraphicsView {
 signals:
 	void fontPrintScaleChanged(double scale);
 	void enableToolbar(bool enable);
-	void enableShortcuts();
-	void disableShortcuts(bool paste);
 	void editCurrentDive();
 
 public