Add mixed comments to input code, make some tooltip clearer

Source/Core/InputCommon/ControllerEmu/ControlGroup/ControlGroup.cpp

@@ -44,7 +44,7 @@ void ControlGroup::AddDeadzoneSetting(SettingValue<double>* value, double maximu
               // i18n: The percent symbol.
               _trans("%"),
               // i18n: Refers to the dead-zone setting of gamepad inputs.
-              _trans("Input strength to ignore.")},
+              _trans("Input strength to ignore and remap.")},
              0, 0, maximum_deadzone);
 }
 

Source/Core/InputCommon/ControllerEmu/ControlGroup/IMUGyroscope.cpp

@@ -40,7 +40,7 @@ IMUGyroscope::IMUGyroscope(std::string name_, std::string ui_name_)
               // i18n: "°/s" is the symbol for degrees (angular measurement) divided by seconds.
               _trans("°/s"),
               // i18n: Refers to the dead-zone setting of gyroscope input.
-              _trans("Angular velocity to ignore.")},
+              _trans("Angular velocity to ignore and remap.")},
              2, 0, 180);
 
   AddSetting(&m_calibration_period_setting,

Source/Core/InputCommon/ControllerEmu/StickGate.cpp

@@ -128,6 +128,7 @@ std::optional<u32> SquareStickGate::GetIdealCalibrationSampleCount() const
 ReshapableInput::ReshapableInput(std::string name_, std::string ui_name_, GroupType type_)
     : ControlGroup(std::move(name_), std::move(ui_name_), type_)
 {
+  // 50 is not always enough but users can set it to more with an expression
   AddDeadzoneSetting(&m_deadzone_setting, 50);
 }
 
@@ -285,6 +286,10 @@ ReshapableInput::ReshapeData ReshapableInput::Reshape(ControlState x, ControlSta
   x -= m_center.x;
   y -= m_center.y;
 
+  // We run this even if both x and y will be zero.
+  // In that case, std::atan2(0, 0) returns a valid non-NaN value, but the exact value
+  // (which depends on the signs of x and y) does not matter here as dist is zero
+
   // TODO: make the AtAngle functions work with negative angles:
   ControlState angle = std::atan2(y, x) + MathUtil::TAU;