Unicode character support in screen tab names

Author: Explorer09

Action.c

@@ -419,7 +419,8 @@ Htop_Reaction Action_setScreenTab(State* st, int x) {
    int rem = x - SCREEN_TAB_MARGIN_LEFT;
    for (unsigned int i = 0; i < settings->nScreens; i++) {
       const char* tab = settings->screens[i]->heading;
-      int width = rem >= bracketWidth ? (int)strnlen(tab, rem - bracketWidth + 1) : 0;
+      const char* ptr = tab;
+      int width = rem >= bracketWidth ? String_mbswidth(&ptr, SIZE_MAX, rem - bracketWidth + 1) : 0;
       if (width >= rem - bracketWidth + 1) {
          settings->ssIndex = i;
          setActiveScreen(settings, st, i);

ScreenManager.c

@@ -177,9 +177,10 @@ static inline bool drawTab(const int* y, int* x, int l, const char* name, bool c
    (*x)++;
    if (*x >= l)
       return false;
-   int nameWidth = (int)strnlen(name, l - *x);
+   const char* ptr = name;
+   int nameWidth = String_mbswidth(&ptr, (size_t)INT_MAX, l - *x);
    attrset(CRT_colors[cur ? SCREENS_CUR_TEXT : SCREENS_OTH_TEXT]);
-   mvaddnstr(*y, *x, name, nameWidth);
+   mvaddnstr(*y, *x, name, (int)(ptr - name));
    *x += nameWidth;
    if (*x >= l)
       return false;