the Export path not works when Export PCK/Zip

[alexzheng]

Godot version:

3.2.1

OS/device including version:

macOS 10.15.5

Issue description:

When click Export PCK/ZIP, the default directory is the project root directory, not the Export Path.

And the Export with Debug Checkbox is always checked on.

Steps to reproduce:
Create a project
do export for any platform
close the project
reopen the same project
click Export PCK/ZIP
the default directory is not the export path and the Export with Debug is always on.

Without restarting the project,these options are recorded on export.

Minimal reproduction project:

[mrushyendra]

The following change would fix the issue:

--- a/editor/project_export.cpp
+++ b/editor/project_export.cpp
@@ -876,6 +876,18 @@ void ProjectExportDialog::_tree_changed() {
 }
 
 void ProjectExportDialog::_export_pck_zip() {
+       Ref<EditorExportPreset> current = get_current_preset();
+       ERR_FAIL_COND(current.is_null());
+
+       String p_path = current->get_export_path();
+       if (p_path != "") {
+               int pos = MAX(p_path.find_last("/"), p_path.find_last("\\"));
+               if (pos != -1) {
+                       String dir = p_path.substr(0, pos);
+                       export_pck_zip->set_current_dir(dir);
+               }
+       }
        export_pck_zip->popup_centered_ratio();
 }

Before submitting a PR, I wanted to confirm what the expected behavior should be. Right now the code seems to explicitly use the export path only for the general Export case, and intentionally ignores the path for the Export PCK/ZIP case. Is there a reason for this?

In fact, currently the Export Path is not a directory, but must be a specific file ending with the appropriate extension, e.g. .x86-64. To show the same folder when exporting as PCK/ZIP requires a slightly-hackish behavior to parse the file directory out from the entire path as shown above.

[alexzheng]

Take iOS export for example,
the work flow would be:

1.export the Xcode project
2.do some custom settings to the Xcode project
3.run the Xcode project on device
4.do some modification in Godot Project
5.export PCK/ZIP to update the old one in the Xcode project

then again loop 3 - 4- 5

It would be expected the PCK/ZIP export path alway the same as the Xcode project root directory.

Currently, the default directory for PCK/ZIP is the Godot project root directory, I think nobody would export the PCK/ZIP to the Godot project.

[alexzheng]

@mrushyendra
How about this issue?
It's quite time consuming to select the directory each time when update the PCK file for exported iOS project.

[alexzheng]

@mrushyendra
I have tested the above code, it works, please commit it. Thanks.