Odd behaviors when renaming the master mixer channel.

Windows 10 Pro, 64-bit OS.

GUI bugs. They happen most of the time.

They are present in RC.4, but not in master.

• Bug 1:
  To reproduce:

1. On the master mixer channel, double-click it or right-click it then select "Rename channel".
   The green border of the naming box isn't there.
   
2. Click anywhere in the mixer other than the channel itself.
3. Do step 1 again then press enter.
   The name of the channel is highlighted in gray as if it was selected.
   

While bug 1 is present in a project then opening a new project, the bug will be present in it.

This bug can't be undone unless LMMS is closed.

• Bug 2:
  To reproduce:

1. Add a mixer channel if there isn't one.
2. Do step 1 in bug 1.
   The green border of the naming box isn't there, too.
3. Click any mixer channel other than the master one.
   

While bug 2 is present in a project then opening a new project, the name of the channel in the new project will be the same as the old project like this:

This bug can be undone by doing step 1 in bug 1, but this will result in bug 1.

Start by reproducing both renaming scenarios in the mixer on Windows 10, comparing RC.4 with master as described. Verify the master and added-channel naming boxes retain their green border, selection state, and names when switching projects; done means both reported behaviors are fixed without introducing the other bug.