### 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
GLES3::Config *config = GLES3::Config::get_singleton();
	if (state.shadow_fb == 0) {
		glActiveTexture(GL_TEXTURE0);
		glGenFramebuffers(1, &state.shadow_fb);
		glBindFramebuffer(GL_FRAMEBUFFER, state.shadow_fb);
		glGenRenderbuffers(1, &state.shadow_depth_buffer);
		glBindRenderbuffer(GL_RENDERBUFFER, state.shadow_depth_buffer);
		glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT24, state.shadow_texture_size, data.max_lights_per_render * 2);
		glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, state.shadow_depth_buffer);
		glGenTextures(1, &state.shadow_texture);
		glBindTexture(GL_TEXTURE_2D, state.shadow_texture);
		if (config->float_texture_supported) {
			glTexImage2D(GL_TEXTURE_2D, 0, GL_R32F, state.shadow_texture_size, data.max_lights_per_render * 2, 0, GL_RED, GL_FLOAT, nullptr);
		} else {
			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, state.shadow_texture_size, data.max_lights_per_render * 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
		}
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1);
		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, state.shadow_texture, 0);
		GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
		if (status != GL_FRAMEBUFFER_COMPLETE) {
			glDeleteFramebuffers(1, &state.shadow_fb);