Columns/Main/Meters panels: move const calc expression out of loop

ColumnsPanel.c

@@ -36,7 +36,8 @@ static void ColumnsPanel_delete(Object* object) {
 
 static void ColumnsPanel_cancelMoving(ColumnsPanel* this) {
    Panel* super = &this->super;
-   for (int i = 0; i < Panel_size(super); i++) {
+   const int n = Panel_size(super);
+   for (int i = 0; i < n; i++) {
       ListItem* item = (ListItem*) Panel_get(super, i);
       if (item)
          item->moving = false;

MainPanel.c

@@ -38,7 +38,8 @@ void MainPanel_updateLabels(MainPanel* this, bool list, bool filter) {
 static void MainPanel_idSearch(MainPanel* this, int ch) {
    Panel* super = &this->super;
    pid_t id = ch - 48 + this->idSearch;
-   for (int i = 0; i < Panel_size(super); i++) {
+   const int n = Panel_size(super);
+   for (int i = 0; i < n; i++) {
       const Row* row = (const Row*) Panel_get(super, i);
       if (row && row->id == id) {
          Panel_setSelected(super, i);
@@ -181,7 +182,8 @@ bool MainPanel_foreachRow(MainPanel* this, MainPanel_foreachRowFn fn, Arg arg, b
    Panel* super = &this->super;
    bool ok = true;
    bool anyTagged = false;
-   for (int i = 0; i < Panel_size(super); i++) {
+   const int n = Panel_size(super);
+   for (int i = 0; i < n; i++) {
       Row* row = (Row*) Panel_get(super, i);
       if (row->tag) {
          ok &= fn(row, arg);

MetersPanel.c

@@ -53,7 +53,8 @@ void MetersPanel_setMoving(MetersPanel* this, bool moving) {
    this->moving = moving;
    if (!moving) {
       /* Reset all items' moving flags when canceling move mode */
-      for (int i = 0; i < Panel_size(super); i++) {
+      const int n = Panel_size(super);
+      for (int i = 0; i < n; i++) {
          ListItem* item = (ListItem*) Panel_get(super, i);
          if (item)
             item->moving = false;
@@ -223,7 +224,8 @@ MetersPanel* MetersPanel_new(Settings* settings, const char* header, Vector* met
    this->rightNeighbor = NULL;
    this->leftNeighbor = NULL;
    Panel_setHeader(super, header);
-   for (int i = 0; i < Vector_size(meters); i++) {
+   const int n = Vector_size(meters);
+   for (int i = 0; i < n; i++) {
       const Meter* meter = (const Meter*) Vector_get(meters, i);
       Panel_add(super, (Object*) Meter_toListItem(meter, false));
    }