[apps/calculation] Factorize some code

apps/calculation/calculation.cpp

@@ -41,8 +41,7 @@ Calculation * Calculation::next() const {
 void Calculation::tidy() {
   /* Reset height memoization (the complex format could have changed when
    * re-entering Calculation app which would impact the heights). */
-  m_height = -1;
-  m_expandedHeight = -1;
+  resetHeightMemoization();
 }
 
 const char * Calculation::approximateOutputText(NumberOfSignificantDigits numberOfSignificantDigits) const {
@@ -193,9 +192,9 @@ Calculation::DisplayOutput Calculation::displayOutput(Context * context) {
 void Calculation::forceDisplayOutput(DisplayOutput d) {
   m_displayOutput = d;
   // Reset heights memoization as it might have changed when we modify the display output
-  m_height = -1;
-  m_expandedHeight = -1;
+  resetHeightMemoization();
 }
+
 bool Calculation::shouldOnlyDisplayExactOutput() {
   /* If the input is a "store in a function", do not display the approximate
    * result. This prevents x->f(x) from displaying x = undef. */
@@ -290,4 +289,9 @@ Calculation::AdditionalInformationType Calculation::additionalInformationType(Co
   return AdditionalInformationType::None;
 }
 
+void  Calculation::resetHeightMemoization() {
+  m_height = -1;
+  m_expandedHeight = -1;
+}
+
 }

apps/calculation/calculation.h

@@ -99,6 +99,7 @@ private:
   static constexpr int k_numberOfExpressions = 4;
   static constexpr KDCoordinate k_heightComputationFailureHeight = 50;
   static constexpr const char * k_maximalIntegerWithAdditionalInformation = "10000000000000000";
+  void resetHeightMemoization();
   /* Buffers holding text expressions have to be longer than the text written
    * by user (of maximum length TextField::maxBufferSize()) because when we
    * print an expression we add omitted signs (multiplications, parenthesis...) */