Upside down text for mirrored transformer

[Vort]

1. Place Symmetric Transformer.
2. Mirror it with Ctrl+M.
3. Save schematic.
4. Close schematic.
5. Open schematic again.

T1 and T2 labels becomes upside down.

Tested with QUCS 0.0.20 (4205dd3) on Windows 7 SP1 x64.

[Rmano]

Happens the same in Linux; confirmed to be not Windows-specific.

[in3otd]

I've checked the past Qucs releases and this issue has been there since quite some time, the oldest I tried was 0.0.15 and it behaves the same.

[ddrake]

I'm seeing the same issue also on Ubuntu 20.04 for the following components in Qucs 0.0.20:
Transformer, Mutual inductors, 3 mutual inductors, AM modulated source, PM modulated source, 2Bit Full Adder, RS-FlipFlop, 4 to 16 Demux, etc... (some of these may rarely need to be mirrored).

I noticed that MultiViewComponents like Microstrip Tee don't have this issue. As a test, I changed the Symmetric Transformer to derive from MultiViewComponent instead of Component (this required moving the symbol drawing code into a protected method createSymbol). That fixed the issue in this case. I've just started looking at the source code, and I'm not sure if this makes sense as a permanent fix, but maybe gives a clue to where the issue lies.

[felix-salfelder]

Now that we have moved past Qt3/4 it might make sense to refactor symbols and de-duplicate code. It seems that several symbols implement coordinates, drawing, geometry, text in different ways. :(

MultiViewComponent must be renamed to reflect its purpose (if any), or removed.