Fixed a couple of undefined behaviors

Conditions depending on uninitialized memory. Benign, though.

2 files changed, 4 insertions, 1 deletions

diff --git a/src/ui/listwidget.c b/src/ui/listwidget.c
index 2e5519a5..e7b4fc22 100644
--- a/src/ui/listwidget.c
+++ b/src/ui/listwidget.c
@@ -67,6 +67,7 @@ void init_ListWidget(iListWidget *d) {
     addChild_Widget(w, iClob(d->scroll = new_ScrollWidget()));
     setThumb_ScrollWidget(d->scroll, 0, 0);
     d->scrollY = 0;
+    d->itemHeight = 0;
     init_PtrArray(&d->items);
     d->hoverItem = iInvalidPos;
     init_Click(&d->click, d, SDL_BUTTON_LEFT);
diff --git a/src/ui/scrollwidget.c b/src/ui/scrollwidget.c
index e1893fec..e887ddbf 100644
--- a/src/ui/scrollwidget.c
+++ b/src/ui/scrollwidget.c
@@ -75,7 +75,9 @@ static iRect thumbRect_ScrollWidget_(const iScrollWidget *d) {
 }
 
 static void checkVisible_ScrollWidget_(iScrollWidget *d) {
-    setFlags_Widget(as_Widget(d), hidden_WidgetFlag, height_Rect(thumbRect_ScrollWidget_(d)) == 0);
+    setFlags_Widget(as_Widget(d),
+                    hidden_WidgetFlag,
+                    d->thumbSize != 0 ? height_Rect(thumbRect_ScrollWidget_(d)) == 0 : iTrue);
 }
 
 void setRange_ScrollWidget(iScrollWidget *d, iRangei range) {