Crash in ui::Widget::initTheme from app::ColorBar::ScrollableView::onInitTheme

[sentry-io]

Sentry Issue: ASEPRITE-ZP

EXC_BAD_ACCESS / KERN_INVALID_ADDRESS / 0x2ac: Fatal Error: EXC_BAD_ACCESS / KERN_INVALID_ADDRESS / 0x2ac
  File "widget.cpp", line 120, in ui::Widget::initTheme
    InitThemeEvent ev(this, m_theme);
  File "widget.cpp", line 1698, in ui::Widget::onInitTheme
    child->initTheme();
  File "color_bar.cpp", line 127, in app::ColorBar::ScrollableView::onInitTheme
    View::onInitTheme(ev);
  File "widget.cpp", line 121, in ui::Widget::initTheme
    onInitTheme(ev);
  File "widget.cpp", line 1698, in ui::Widget::onInitTheme
    child->initTheme();
...
(43 additional frame(s) were not displayed)

[dacap]

I thought it was related to 2321311 and #3504 but this crash is unrelated.