3-to-4 project converter doesn't preserve viewport width and height

[daveTheOldCoder]

Godot version

4.0.beta1

System information

Linux (Pop!_OS 20.04)

Issue description

3-to-4 project converter changes viewport width and height. I would expect them to remain the same.

Steps to reproduce

Create a new Godot 3.x project. I used Godot 3.5.1.rc1.

Change the width and height in the project settings to 1280x720 (Project >> Project Settings... >> General >> Display >> Window >> Size >> Width,Height).

The 3.x minimal reproduction project attached below already has this change.

Import the project in Godot 4.0.beta1 and select Convert Full Project.

Go to Project >> Project Settings... >> General >> Display >> Window >> Size and enable Advanced Settings.

The Width and Height values are preserved, but the Viewport Width and Viewport Height have different values: 1152 and 648, respectively.

Minimal reproduction project

project_converter_3_to_4-bug3.zip

[fire]

Not sure, but I recall the view rect was flipped, maybe it has a clamp on negative numbers.

[Calinou]

Not sure, but I recall the view rect was flipped, maybe it has a clamp on negative numbers.

This is unrelated. The issue is the project settings not being renamed when running 3to4.

[gotnospirit]

The rename aren't defined but, after few tests, it looks like no rename can be applied for a project.godot file.
I see them used for ".gd" and ".tscn" files (project settings are allowed here?), so maybe it works in this case but not (as is) for project.godot, because this file uses a .ini format

godot/editor/project_converter_3_to_4.cpp

Lines 1963 to 1972 in 34e28f2

	if (file_name.ends_with(".gd")) {
	rename_classes(lines, reg_container); // Using only specialized function.
	rename_common(enum_renames, reg_container.enum_regexes, lines);
	rename_colors(lines, reg_container); // Require to additional rename.
	rename_common(gdscript_function_renames, reg_container.gdscript_function_regexes, lines);
	rename_gdscript_functions(lines, reg_container, false); // Require to additional rename.
	rename_common(project_settings_renames, reg_container.project_settings_regexes, lines);

[Calinou]

cc @qarmin