Fix #35054: adjust tooltip for Render Border option in 3D view panel to say

it has an effect outside of the camera view.

release/scripts/startup/bl_ui/space_view3d.py

@@ -2392,6 +2392,7 @@ class VIEW3D_PT_view3d_properties(Panel):
 
         col = layout.column(align=True)
         col.prop(view, "use_render_border")
+        col.active = view.region_3d.view_perspective != 'CAMERA'
 
 
 class VIEW3D_PT_view3d_cursor(Panel):

source/blender/makesrna/intern/rna_space.c

@@ -1657,7 +1657,7 @@ static void rna_def_space_view3d(BlenderRNA *brna)
 	RNA_def_property_boolean_sdna(prop, NULL, "flag2", V3D_RENDER_BORDER);
 	RNA_def_property_clear_flag(prop, PROP_ANIMATABLE);
 	RNA_def_property_ui_text(prop, "Render Border",
-	                         "Use a user-defined border region within the frame size for rendered viewport");
+	                         "Use a region within the frame size for rendered viewport (when not viewing through the camera)");
 	RNA_def_property_update(prop, NC_SPACE | ND_SPACE_VIEW3D, NULL);
 
 	prop = RNA_def_property(srna, "render_border_min_x", PROP_FLOAT, PROP_NONE);