Rename kinetic scroll "sensitivity" to "threshold"

Since that's what it really is, so it's more obvious what this setting
does. This inverts the value, 0 threshold is the same as 100 sensitivity
previously. The default value is now 10, since otherwise it's very easy
to make errant inputs with the slightest amount of slop.

src/desktop/dialogs/settingsdialog/userinterface.cpp

@@ -104,22 +104,21 @@ void UserInterface::initKineticScrolling(
 	settings.bindKineticScrollGesture(kineticScrollGesture, Qt::UserRole);
 	form->addRow(tr("Kinetic scrolling:"), kineticScrollGesture);
 
-	KisSliderSpinBox *sensitivity = new KisSliderSpinBox;
-	sensitivity->setRange(0, 100);
-	sensitivity->setPrefix(tr("Sensitivity: "));
-	settings.bindKineticScrollSensitivity(sensitivity);
-	form->addRow(nullptr, sensitivity);
+	KisSliderSpinBox *threshold = new KisSliderSpinBox;
+	threshold->setRange(0, 100);
+	threshold->setPrefix(tr("Threshold: "));
+	settings.bindKineticScrollThreshold(threshold);
+	form->addRow(nullptr, threshold);
 
 	QCheckBox *hideBars = new QCheckBox(tr("Hide scroll bars"));
 	settings.bindKineticScrollHideBars(hideBars);
 	form->addRow(nullptr, hideBars);
 
-	settings.bindKineticScrollGesture(
-		this, [sensitivity, hideBars](int gesture) {
-			bool enabled = gesture != int(KineticScrollGesture::None);
-			sensitivity->setEnabled(enabled);
-			hideBars->setEnabled(enabled);
-		});
+	settings.bindKineticScrollGesture(this, [threshold, hideBars](int gesture) {
+		bool enabled = gesture != int(KineticScrollGesture::None);
+		threshold->setEnabled(enabled);
+		hideBars->setEnabled(enabled);
+	});
 
 	form->addRow(
 		nullptr, utils::note(

src/desktop/settings_table.h

@@ -64,7 +64,7 @@ SETTING(interfaceMode             , InterfaceMode             , "settings/interf
 SETTING(inviteLinkType            , InviteLinkType            , "invites/linktype"                      , dialogs::InviteDialog::LinkType::Web)
 SETTING(inviteIncludePassword     , InviteIncludePassword     , "invites/includepassword"               , false)
 SETTING(kineticScrollGesture      , KineticScrollGesture      , "settings/kineticscroll/gesture"        , int(KINETIC_SCROLL_GESTURE_DEFAULT))
-SETTING(kineticScrollSensitivity  , KineticScrollSensitivity  , "settings/kineticscroll/sensititivy"    , 100)
+SETTING(kineticScrollThreshold    , KineticScrollThreshold    , "settings/kineticscroll/threshold"      , 10)
 SETTING(kineticScrollHideBars     , KineticScrollHideBars     , "settings/kineticscroll/hidebars"       , false)
 SETTING(language                  , Language                  , "settings/language"                     , QString())
 SETTING(lastAnnounce              , LastAnnounce              , "history/announce"                      , false)

src/desktop/utils/widgetutils.cpp

@@ -106,7 +106,8 @@ void initKineticScrolling(QAbstractScrollArea *scrollArea)
 	// SPDX-License-Identifier: GPL-3.0-or-later
 	// SDPX—SnippetName: Kinetic scroll setup from Krita
 	if(scrollArea && enabled) {
-		int sensitivity = settings.kineticScrollSensitivity();
+		int sensitivity =
+			100 - qBound(0, settings.kineticScrollThreshold(), 100);
 		bool hideScrollBars = settings.kineticScrollHideBars();
 		float resistanceCoefficient = 10.0f;
 		float dragVelocitySmoothFactor = 1.0f;