Replace String comparisons with "", String() to is_empty()

Also:
- Adds two stress tests to test_string.h
- Changes to .empty() on std::strings

1 files changed, 1 insertions, 1 deletions

diff --git a/servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp b/servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp
index d013099cce..2ff7f27d33 100644
--- a/servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp
+++ b/servers/rendering/renderer_rd/renderer_canvas_render_rd.cpp
@@ -1953,7 +1953,7 @@ void RendererCanvasRenderRD::ShaderData::set_code(const String &p_code) {
 	uses_sdf = false;
 	uses_time = false;
 
-	if (code == String()) {
+	if (code.is_empty()) {
 		return; //just invalid, but no error
 	}