Implicitly capturing "this" with the capture default "=" is deprecated
with C++20. We fix this by either explicitly passing this, or by copying
the required members manually.
While this exposes some rather expensive copies like the QList
selectedItems in OBSBasic_Preview, it doesn't introduce them ("=" copies
implicitly).
Implicit capture of 'this' with a capture default of '=' is deprecated
in C++20.
# Conflicts:
# frontend/settings/OBSBasicSettings.cpp
# frontend/settings/OBSHotkeyEdit.cpp
# frontend/settings/OBSHotkeyWidget.cpp
SetComboByName, SetComboByValue and SetInvalidValue all pass their
parameters to Qt functions which only take QStrings. As a consequence,
we have cases we'd convert a QString to a const char* to call these
functions, only for the functions to implicitly convert them back into
QStrings. We can avoid this by passing QStrings directly. In cases where
we did actually pass const chars, the (implicit) conversion now just
takes place earlier.
This removes the need to provide an undocumented launch argument to
enable custom RTMP service configurations to use multitrack encoding
and also provide a custom configuration.
While the Metal renderer is displayed as "Metal (Experimental)", the
"Experimental" part doesn't need to be stored to the config. Otherwise,
anyone having selected the Metal renderer will have it get unselected
once the "Experimental" part is removed, and presumably the people who
have it selected while it's experimental would also be the people who
would want it once it's stable.
