Fix error exporting to X11 with embedded PCK

Fixes #32513.

Validate instances of objects before trying to check their type in GDScript

Fix function arguments hint format in GDScript editor

Adds null check before using image loader

#34161: Keep a weak reference to orphan subclasses to reuse on class reload

Fixes #27582

Fix slight problems related to default values of exported typed arrays

Fixed unknown ASCII symbols rendered instead of tabs in bookmarks list

Refactor (and fix) how the connect button is disabled.

Tab characters were not rendered properly in the breakpoints and
bookmarks lists of the script editor if the bookmarked line was a
comment, resulting in unknown ASCII symbols “�”.

Fixes #34046.

Also changed formatting a bit to enclose the code in backticks (like in
Markdown) instead of quotes.
Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>

for consistency with the format of the documentation:
"type func_name(arg1: type, arg2: type)"

Travis: Disable -Wstrict-aliasing warning on GCC 5 test build

Disabled array initialization, const array and arr.length in GLES2 shaders

Should speed up builds by avoiding warning spam.
This warning is no longer raised by newer GCC versions.

It should not be possible to click the "Connect" button unless

  - a node is selected, and
  - that node is valid in the current mode.

The modes are the default and advanced modes which allow connecting to scripts
and nodes respectively.

Prevent crash described in #34555.

MinGW: Avoid GCC -Wcast-function-type warnings on GetProcAddress

Using the same method as GNUlib and various other projects.
https://lists.gnu.org/archive/html/bug-gnulib/2018-08/msg00109.html

The warning is valid, but there's no way around it since the issue
comes from the Windows SDK. It's also harmless in this case.

Part of #29801.

Validate input in (CPU)Particles set_emission_shape()

Fixes #29777.
Co-authored-by: Cameron Reikes <cameronreikes@gmail.com>

Fix light related crashes

Use int64_t for EditorPropertyInteger and warn when out of double range

Fix scrollbar regression on large scales

Updates ScrollContainer min size when toggle scrollbars

Fix Vsync Via Compositor causing halved refresh rate when vsync is forced by the graphics driver

Fix array constructor for lightmaps

Add background mode keep to GLES2

Mono/C#: Fix false positive in unsafe reference checks