Restore highlighted header of current sorted process column

MainPanel.c

@@ -102,7 +102,7 @@ static HandlerResult MainPanel_eventHandler(Panel* super, int ch) {
       MainPanel_updateTreeFunctions(this, this->state->settings->treeView);
    }
    if (reaction & HTOP_UPDATE_PANELHDR) {
-      ProcessList_printHeader(this->state->pl, Panel_getHeader(super));
+      result |= REDRAW;
    }
    if (reaction & HTOP_REFRESH) {
       result |= REFRESH;
@@ -168,13 +168,19 @@ static void MainPanel_drawFunctionBar(Panel* super) {
    }
 }
 
+static void MainPanel_printHeader(Panel* super) {
+   MainPanel* this = (MainPanel*) super;
+   ProcessList_printHeader(this->state->pl, &super->header);
+}
+
 const PanelClass MainPanel_class = {
    .super = {
       .extends = Class(Panel),
       .delete = MainPanel_delete
    },
    .eventHandler = MainPanel_eventHandler,
-   .drawFunctionBar = MainPanel_drawFunctionBar
+   .drawFunctionBar = MainPanel_drawFunctionBar,
+   .printHeader = MainPanel_printHeader
 };
 
 MainPanel* MainPanel_new() {

Panel.c

@@ -76,13 +76,6 @@ void Panel_setSelectionColor(Panel* this, ColorElements colorId) {
    this->selectionColorId = colorId;
 }
 
-RichString* Panel_getHeader(Panel* this) {
-   assert (this != NULL);
-
-   this->needsRedraw = true;
-   return &(this->header);
-}
-
 inline void Panel_setHeader(Panel* this, const char* header) {
    RichString_writeWide(&(this->header), CRT_colors[PANEL_HEADER_FOCUS], header);
    this->needsRedraw = true;
@@ -228,15 +221,20 @@ void Panel_draw(Panel* this, bool force_redraw, bool focus, bool highlightSelect
    int x = this->x;
    int h = this->h;
 
-   int headerLen = RichString_sizeVal(this->header);
+   const int header_attr = focus
-   if (headerLen > 0) {
-      int attr = focus
                          ? CRT_colors[PANEL_HEADER_FOCUS]
                          : CRT_colors[PANEL_HEADER_UNFOCUS];
-      attrset(attr);
+   if (force_redraw) {
+      if (Panel_printHeaderFn(this))
+         Panel_printHeader(this);
+      else
+         RichString_setAttr(&this->header, header_attr);
+   }
+   int headerLen = RichString_sizeVal(this->header);
+   if (headerLen > 0) {
+      attrset(header_attr);
       mvhline(y, x, ' ', this->w);
       if (scrollH < headerLen) {
-         RichString_setAttr(&this->header, attr);
          RichString_printoffnVal(this->header, y, x, scrollH,
             MINIMUM(headerLen - scrollH, this->w));
       }

Panel.h

@@ -37,11 +37,13 @@ typedef enum HandlerResult_ {
 
 typedef HandlerResult (*Panel_EventHandler)(Panel*, int);
 typedef void (*Panel_DrawFunctionBar)(Panel*);
+typedef void (*Panel_PrintHeader)(Panel*);
 
 typedef struct PanelClass_ {
    const ObjectClass super;
    const Panel_EventHandler eventHandler;
    const Panel_DrawFunctionBar drawFunctionBar;
+   const Panel_PrintHeader printHeader;
 } PanelClass;
 
 #define As_Panel(this_)                 ((const PanelClass*)((this_)->super.klass))
@@ -49,6 +51,8 @@ typedef struct PanelClass_ {
 #define Panel_eventHandler(this_, ev_)  (assert(As_Panel(this_)->eventHandler), As_Panel(this_)->eventHandler((Panel*)(this_), ev_))
 #define Panel_drawFunctionBarFn(this_)  As_Panel(this_)->drawFunctionBar
 #define Panel_drawFunctionBar(this_)    (assert(As_Panel(this_)->drawFunctionBar), As_Panel(this_)->drawFunctionBar((Panel*)(this_)))
+#define Panel_printHeaderFn(this_)      As_Panel(this_)->printHeader
+#define Panel_printHeader(this_)        (assert(As_Panel(this_)->printHeader), As_Panel(this_)->printHeader((Panel*)(this_)))
 
 struct Panel_ {
    Object super;
@@ -84,8 +88,6 @@ void Panel_done(Panel* this);
 
 void Panel_setSelectionColor(Panel* this, ColorElements colorId);
 
-RichString* Panel_getHeader(Panel* this);
-
 void Panel_setHeader(Panel* this, const char* header);
 
 void Panel_move(Panel* this, int x, int y);

ScreenManager.c

@@ -141,7 +141,7 @@ void ScreenManager_run(ScreenManager* this, Panel** lastFocus, int* lastKey) {
 
    bool timedOut = true;
    bool redraw = true;
-   bool force_redraw = false;
+   bool force_redraw = true;
    bool rescan = false;
    int sortTimeout = 0;
    int resetSortTimeout = 5;

htop.c

@@ -313,8 +313,6 @@ int main(int argc, char** argv) {
 
    MainPanel_updateTreeFunctions(panel, settings->treeView);
 
-   ProcessList_printHeader(pl, Panel_getHeader((Panel*)panel));
-
    State state = {
       .settings = settings,
       .ut = ut,