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Fix scroll bars appearing inconsistently, especially when resized #7911

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Fix scroll bars appearing inconsistently, especially when resized #7911

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4674903
Fix scroll area jittering
HactarCE Feb 15, 2026
1f1286d
Round again after subtracting `current_bar_use`
HactarCE Feb 15, 2026
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15 changes: 8 additions & 7 deletions crates/egui/src/containers/scroll_area.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -734,7 +734,11 @@ impl ScrollArea {

let current_bar_use = show_bars_factor.yx() * ui.spacing().scroll.allocated_width();

let available_outer = ui.available_rect_before_wrap();
// Round to pixels to avoid widgets appearing to "float" when scrolling fractional amounts:
let available_outer = ui
.available_rect_before_wrap()
.round_to_pixels(ui.pixels_per_point())
.round_ui();

let outer_size = available_outer.size().at_most(max_size);

Expand All @@ -750,7 +754,9 @@ impl ScrollArea {
inner_size[d] = inner_size[d].max(min_scrolled_size[d]);
}
}
inner_size

// Round to pixels again because `current_bar_use` might have offset it
inner_size.round_to_pixels(ui.pixels_per_point()).round_ui()
};

let inner_rect = Rect::from_min_size(available_outer.min, inner_size);
Expand All @@ -771,11 +777,6 @@ impl ScrollArea {

let content_max_rect = Rect::from_min_size(inner_rect.min - state.offset, content_max_size);

// Round to pixels to avoid widgets appearing to "float" when scrolling fractional amounts:
let content_max_rect = content_max_rect
.round_to_pixels(ui.pixels_per_point())
.round_ui();

let mut content_ui = ui.new_child(
UiBuilder::new()
.ui_stack_info(UiStackInfo::new(UiKind::ScrollArea))
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