Temporarily allow plugin to set input method
Temporarily allow plugin to set input method

Currently window group tries to set input method area, but assumes
whole plugin window is input method area. That is not expected to
hold, quite contrary on fullscreen plugins.

Restored ability for plugins to tell the size until a proper
mechanisms is implemented.

Mostly reverts commit 0458eed4af3abf02ac95bf35f66e9af135a89d6d.

RevBy: Jan Arne Petersen

jpetersen/framework,RHawkeyed/framework,jpetersen/framework,binlaten/framework,Elleo/framework,RHawkeyed/framework,Elleo/framework