Abstract resize handling by adding a new Htop reaction

Action.c

@@ -388,10 +388,7 @@ Htop_Reaction Action_follow(State* st) {
 
 static Htop_Reaction actionSetup(State* st) {
    Action_runSetup(st);
-   int headerHeight = Header_calculateHeight(st->header);
-   Panel_move((Panel*)st->mainPanel, 0, headerHeight);
-   Panel_resize((Panel*)st->mainPanel, COLS, LINES - headerHeight - 1);
-   return HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR;
+   return HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR | HTOP_RESIZE;
 }
 
 static Htop_Reaction actionLsof(State* st) {

Action.h

@@ -30,6 +30,7 @@ typedef enum {
    HTOP_QUIT            = 0x10,
    HTOP_REDRAW_BAR      = 0x20,
    HTOP_UPDATE_PANELHDR = 0x40 | HTOP_REFRESH,
+   HTOP_RESIZE          = 0x80 | HTOP_REFRESH | HTOP_REDRAW_BAR | HTOP_UPDATE_PANELHDR,
 } Htop_Reaction;
 
 struct MainPanel_;

MainPanel.c

@@ -112,6 +112,9 @@ static HandlerResult MainPanel_eventHandler(Panel* super, int ch) {
    if (reaction & HTOP_REDRAW_BAR) {
       MainPanel_updateTreeFunctions(this, this->state->settings->treeView);
    }
+   if (reaction & HTOP_RESIZE) {
+      result |= RESIZE;
+   }
    if (reaction & HTOP_UPDATE_PANELHDR) {
       result |= REDRAW;
    }

Panel.h

@@ -26,7 +26,8 @@ typedef enum HandlerResult_ {
    REFRESH     = 0x08,
    REDRAW      = 0x10,
    RESCAN      = 0x20,
-   SYNTH_KEY   = 0x40,
+   RESIZE      = 0x40,
+   SYNTH_KEY   = 0x80,
 } HandlerResult;
 
 #define EVENT_SET_SELECTED (-1)

ScreenManager.c

@@ -243,6 +243,10 @@ void ScreenManager_run(ScreenManager* this, Panel** lastFocus, int* lastKey) {
       if (result & REDRAW) {
          force_redraw = true;
       }
+      if (result & RESIZE) {
+         ScreenManager_resize(this);
+         force_redraw = true;
+      }
       if (result & RESCAN) {
          rescan = true;
          sortTimeout = 0;