st/scroll-view-fade: Don't assume fade area at (0,0)
The shader code currently only accounts for padding for the bottom and right fades, but not for top and left. As a result, we only fade the right edge when swiping through app picker pages, whoops. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1569>
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@ -44,16 +44,18 @@ void main ()
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if (x > fade_area_topleft[0] && x < fade_area_bottomright[0] &&
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y > fade_area_topleft[1] && y < fade_area_bottomright[1]) {
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float ratio = 1.0;
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float fade_top_start = fade_area_topleft[1] + vfade_offset;
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float fade_left_start = fade_area_topleft[0] + hfade_offset;
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float fade_bottom_start = fade_area_bottomright[1] - vfade_offset;
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float fade_right_start = fade_area_bottomright[0] - hfade_offset;
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bool fade_top = y < vfade_offset && fade_edges_top;
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bool fade_bottom = y > fade_bottom_start && fade_edges_bottom;
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bool fade_left = x < hfade_offset && fade_edges_left;
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bool fade_left = x < fade_left_start && fade_edges_left;
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bool fade_right = x > fade_right_start && fade_edges_right;
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float vfade_scale = height / vfade_offset;
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if (fade_top) {
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ratio *= y / vfade_offset;
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ratio *= (fade_area_topleft[1] - y) / (fade_area_topleft[1] - fade_bottom_start);
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}
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if (fade_bottom) {
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@ -62,7 +64,7 @@ void main ()
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float hfade_scale = width / hfade_offset;
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if (fade_left) {
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ratio *= x / hfade_offset;
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ratio *= (fade_area_topleft[0] - x) / (fade_area_topleft[0] - fade_left_start);
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}
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if (fade_right) {
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