UI: Remove X axis panel dragging
X axis panel dragging traces back to Blender versions before 2.5, where panels could be aligned horizontally. But for many years now panels have been vertically aligned. Considering this, keeping the X axis dragging around is a bit odd. It makes interaction confusing, or at least more complicated. It also looks bad, since any part of the panel outside the region is cropped. Differential Revision: https://developer.blender.org/D9549
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@ -1927,20 +1927,16 @@ static void ui_do_drag(const bContext *C, const wmEvent *event, Panel *panel)
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ARegion *region = CTX_wm_region(C);
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/* Keep the drag position in the region with a small pad to keep the panel visible. */
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const int x = clamp_i(event->x, region->winrct.xmin, region->winrct.xmax + DRAG_REGION_PAD);
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const int y = clamp_i(event->y, region->winrct.ymin, region->winrct.ymax + DRAG_REGION_PAD);
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float dx = (float)(x - data->startx);
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float dy = (float)(y - data->starty);
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/* Adjust for region zoom. */
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dx *= BLI_rctf_size_x(®ion->v2d.cur) / (float)BLI_rcti_size_x(®ion->winrct);
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dy *= BLI_rctf_size_y(®ion->v2d.cur) / (float)BLI_rcti_size_y(®ion->winrct);
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/* Add the movement of the view due to edge scrolling while dragging. */
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dx += ((float)region->v2d.cur.xmin - data->start_cur_xmin);
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dy += ((float)region->v2d.cur.ymin - data->start_cur_ymin);
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panel->ofsx = data->startofsx + round_fl_to_int(dx);
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panel->ofsy = data->startofsy + round_fl_to_int(dy);
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uiAlignPanelStep(region, 0.2f, true);
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