diff --git a/source/blender/editors/include/ED_screen.h b/source/blender/editors/include/ED_screen.h
index eddc94fdc5b..ba1703db895 100644
--- a/source/blender/editors/include/ED_screen.h
+++ b/source/blender/editors/include/ED_screen.h
@@ -212,6 +212,11 @@ void ED_area_tag_redraw(ScrArea *area);
 void ED_area_tag_redraw_no_rebuild(ScrArea *area);
 void ED_area_tag_redraw_regiontype(ScrArea *area, int type);
 void ED_area_tag_refresh(ScrArea *area);
+/**
+ * For regions that change the region size in their #ARegionType.layout() callback: Mark the area
+ * as having a changed region size, requiring refitting of regions within the area.
+ */
+void ED_area_tag_region_size_update(ScrArea *area, ARegion *changed_region);
 /**
  * Only exported for WM.
  */
diff --git a/source/blender/editors/interface/interface_region_hud.cc b/source/blender/editors/interface/interface_region_hud.cc
index e2a9fa49542..3777f6ea315 100644
--- a/source/blender/editors/interface/interface_region_hud.cc
+++ b/source/blender/editors/interface/interface_region_hud.cc
@@ -325,12 +325,12 @@ void ED_area_type_hud_ensure(bContext *C, ScrArea *area)
   /* Let 'ED_area_update_region_sizes' do the work of placing the region.
    * Otherwise we could set the 'region->winrct' & 'region->winx/winy' here. */
   if (init) {
-    area->flag |= AREA_FLAG_REGION_SIZE_UPDATE;
+    ED_area_tag_region_size_update(area, region);
   }
   else {
     if (region->flag & RGN_FLAG_HIDDEN) {
       /* Also forces recalculating HUD size in hud_region_layout(). */
-      area->flag |= AREA_FLAG_REGION_SIZE_UPDATE;
+      ED_area_tag_region_size_update(area, region);
     }
     region->flag &= ~RGN_FLAG_HIDDEN;
   }
diff --git a/source/blender/editors/screen/area.cc b/source/blender/editors/screen/area.cc
index 5c25325c512..6b7b9244907 100644
--- a/source/blender/editors/screen/area.cc
+++ b/source/blender/editors/screen/area.cc
@@ -752,6 +752,37 @@ void ED_area_tag_refresh(ScrArea *area)
   }
 }
 
+void ED_area_tag_region_size_update(ScrArea *area, ARegion *changed_region)
+{
+  if (!area || (area->flag & AREA_FLAG_REGION_SIZE_UPDATE)) {
+    return;
+  }
+
+  area->flag |= AREA_FLAG_REGION_SIZE_UPDATE;
+
+  /* Floating regions don't affect other regions, so the following can be skipped. */
+  if (changed_region->alignment == RGN_ALIGN_FLOAT) {
+    return;
+  }
+
+  /* Tag the following regions for redraw, since the size change of this region may affect the
+   * available space for them. */
+  for (ARegion *following_region = changed_region->next; following_region;
+       following_region = following_region->next)
+  {
+    /* Overlapping and non-overlapping regions don't affect each others space. So layout changes
+     * of one don't require redrawing the other. */
+    if (changed_region->overlap != following_region->overlap) {
+      continue;
+    }
+    /* Floating regions don't affect space of other regions. */
+    if (following_region->alignment == RGN_ALIGN_FLOAT) {
+      continue;
+    }
+    ED_region_tag_redraw(following_region);
+  }
+}
+
 /* *************************************************************** */
 
 const char *ED_area_region_search_filter_get(const ScrArea *area, const ARegion *region)
@@ -3111,7 +3142,7 @@ void ED_region_panels_layout_ex(const bContext *C,
       if ((region->sizex != size_dyn[0]) || (region->sizey != size_dyn[1])) {
         region->sizex = size_dyn[0];
         region->sizey = size_dyn[1];
-        area->flag |= AREA_FLAG_REGION_SIZE_UPDATE;
+        ED_area_tag_region_size_update(area, region);
       }
       y = fabsf(region->sizey * UI_SCALE_FAC - 1);
     }
@@ -3432,7 +3463,7 @@ void ED_region_header_layout(const bContext *C, ARegion *region)
       ScrArea *area = CTX_wm_area(C);
 
       region->sizex = new_sizex;
-      area->flag |= AREA_FLAG_REGION_SIZE_UPDATE;
+      ED_area_tag_region_size_update(area, region);
     }
 
     UI_block_end(C, block);