Bugfix, own collection:

File Window draw error:
On start Blender in smaller sized window, a scalled down screen
causes the File Window main area to draw too high, clipping off
half of the top line. This case (scroll horizontal only) is not
handled as view2d type.

source/blender/editors/space_file/space_file.c

@@ -327,6 +327,13 @@ static void file_main_area_draw(const bContext *C, ARegion *ar)
 		v2d->scroll = V2D_SCROLL_BOTTOM;
 		v2d->keepofs &= ~V2D_LOCKOFS_X;
 		v2d->keepofs |= V2D_LOCKOFS_Y;
+		
+		/* XXX this happens on scaling down Screen (like from startup.blend) */
+		/* view2d has no type specific for filewindow case, which doesnt scroll vertically */
+		if(v2d->cur.ymax < 0) {
+			v2d->cur.ymin -= v2d->cur.ymax;
+			v2d->cur.ymax= 0;
+		}
 	}
 	/* v2d has initialized flag, so this call will only set the mask correct */
 	UI_view2d_region_reinit(v2d, V2D_COMMONVIEW_LIST, ar->winx, ar->winy);