[Libreoffice] [Review Request] remove a confusing use of GetMutex() when a SolarMutexGuard is really meant

[Norbert Thiebaud]

The attached patches are pending... I am submitting them to the list
for comments or objections before pushing them.

The patches address the following:

VCLXDevice, VCLXGraphics and derived class use a mutex that is really
a reference to the SolarMutex. They declare a function GetMutex() to
access tis reference to the SolarMutex, and the implementation
use
osl::SolarGuard aGuard(GetMutex())
to take a guard on the solar mutex.

This is confusing because some other class in that framework also implement
a GetMutex() function, but which this time return a regular Mutex.

Since this particular use of GetMutex() is to get the SolarMutex, and
invariably this is then used to take a Guard on the SolarMutex,
all these uses are replaced by a SolarMutexGuard object, which encapsulate
that behavior.


Norbert
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