### Godot version

4.0.rc6.mono.official

### System information

macOS 12.0.1

### Issue description

Just a minor visual issue.

When opening an empty directory the focus highlight is drawn incorrectly. It looks like the UI is drawing a smaller rectangle within the main rect:
<img width="1058" alt="Bildschirmfoto 2023-02-28 um 14 13 31" src="https://user-images.githubusercontent.com/11627131/221868794-7450606d-e758-4104-8f33-182d9779d7f8.png">


This behavior also changes when you hover over other items in the view, so I'm not sure if this a general issue with the focus highlighting or just an issue in the directory view:
<img width="1052" alt="Bildschirmfoto 2023-02-28 um 14 32 54" src="https://user-images.githubusercontent.com/11627131/221869308-4756f26e-cda2-4057-be1e-7439030895dc.png">


### Steps to reproduce

1. New Project
2. Browse
3. Create Folder
4. Click or Tab to set focus on the empty directory view

### Minimal reproduction project

N/A
}
void RasterizerCanvasGLES3::canvas_begin(RID p_to_render_target, bool p_to_backbuffer) {
	GLES3::TextureStorage *texture_storage = GLES3::TextureStorage::get_singleton();
	GLES3::Config *config = GLES3::Config::get_singleton();
	GLES3::RenderTarget *render_target = texture_storage->get_render_target(p_to_render_target);
	if (p_to_backbuffer) {
		glBindFramebuffer(GL_FRAMEBUFFER, render_target->backbuffer_fbo);
		glActiveTexture(GL_TEXTURE0 + config->max_texture_image_units - 4);
		GLES3::Texture *tex = texture_storage->get_texture(texture_storage->texture_gl_get_default(GLES3::DEFAULT_GL_TEXTURE_WHITE));
		glBindTexture(GL_TEXTURE_2D, tex->tex_id);
	} else {
		glBindFramebuffer(GL_FRAMEBUFFER, render_target->fbo);
		glActiveTexture(GL_TEXTURE0 + config->max_texture_image_units - 4);
		glBindTexture(GL_TEXTURE_2D, render_target->backbuffer);
	}
	if (render_target->is_transparent || p_to_backbuffer) {
		state.transparent_render_target = true;
		glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);